creating tables with replacement

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creating tables with replacement

Marna Wagley
Hi R User,
I am new in R and trying to create tables with selecting rows randomly (but
with replacement) for each group but each group should have same number as
original. Is it possible to create it using the following example data set?

Your help is highly appreciated.

dat1<-structure(list(RegionA = structure(c(1L, 1L, 2L, 3L, 3L, 4L,

5L, 5L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L), .Label = c("Ra",

"Rb", "Rc", "Rd", "Re", "Rf"), class = "factor"), site = structure(c(1L,

12L, 13L, 14L, 15L, 16L, 17L, 18L, 19L, 2L, 3L, 4L, 5L, 6L, 7L,

8L, 9L, 10L, 11L), .Label = c("s1", "s10", "s11", "s12", "s13",

"s14", "s15", "s16", "s17", "s18", "s19", "s2", "s3", "s4", "s5",

"s6", "s7", "s8", "s9"), class = "factor"), temp = c(23L, 21L,

10L, 15L, 16L, 8L, 13L, 1L, 23L, 19L, 25L, 19L, 12L, 16L, 19L,

21L, 12L, 5L, 7L), group = structure(c(1L, 1L, 1L, 2L, 2L, 2L,

2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L), .Label = c("A",

"B", "C"), class = "factor")), .Names = c("RegionA", "site",

"temp", "group"), class = "data.frame", row.names = c(NA, -19L

))


Here group A has 3 rows,

B had 7 rows, and

C has 9 rows


I want to select rows randomly (with replacement) for each group but each
group should have same number of rows as above (group A=3 rows, B=7 rows, and
c=9 rows). This way I want to create at least 10 tables (10 random tables)
and save them separately in Excel.


Thanks

        [[alternative HTML version deleted]]

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Re: creating tables with replacement

PIKAL Petr
Hi

maybe there is another more elegant solution but something like this

> idx <- 1:nrow(dat1)
> lll <- split(idx, dat1$group)
> dat1[unlist(lapply(lll, sample, rep=TRUE)),]

gives you selected rows.

You could use for cycle or save those data frames manually

Cheers

Petr

> -----Original Message-----
> From: R-help [mailto:[hidden email]] On Behalf Of Marna
> Wagley
> Sent: Wednesday, October 18, 2017 9:46 AM
> To: r-help mailing list <[hidden email]>
> Subject: [R] creating tables with replacement
>
> Hi R User,
> I am new in R and trying to create tables with selecting rows randomly (but
> with replacement) for each group but each group should have same number as
> original. Is it possible to create it using the following example data set?
>
> Your help is highly appreciated.
>
> dat1<-structure(list(RegionA = structure(c(1L, 1L, 2L, 3L, 3L, 4L,
>
> 5L, 5L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L), .Label = c("Ra",
>
> "Rb", "Rc", "Rd", "Re", "Rf"), class = "factor"), site = structure(c(1L,
>
> 12L, 13L, 14L, 15L, 16L, 17L, 18L, 19L, 2L, 3L, 4L, 5L, 6L, 7L,
>
> 8L, 9L, 10L, 11L), .Label = c("s1", "s10", "s11", "s12", "s13",
>
> "s14", "s15", "s16", "s17", "s18", "s19", "s2", "s3", "s4", "s5",
>
> "s6", "s7", "s8", "s9"), class = "factor"), temp = c(23L, 21L,
>
> 10L, 15L, 16L, 8L, 13L, 1L, 23L, 19L, 25L, 19L, 12L, 16L, 19L,
>
> 21L, 12L, 5L, 7L), group = structure(c(1L, 1L, 1L, 2L, 2L, 2L,
>
> 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L), .Label = c("A",
>
> "B", "C"), class = "factor")), .Names = c("RegionA", "site",
>
> "temp", "group"), class = "data.frame", row.names = c(NA, -19L
>
> ))
>
>
> Here group A has 3 rows,
>
> B had 7 rows, and
>
> C has 9 rows
>
>
> I want to select rows randomly (with replacement) for each group but each
> group should have same number of rows as above (group A=3 rows, B=7 rows,
> and
> c=9 rows). This way I want to create at least 10 tables (10 random tables) and
> save them separately in Excel.
>
>
> Thanks
>
>       [[alternative HTML version deleted]]
>
> ______________________________________________
> [hidden email] mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

________________________________
Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům.
Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně jeho odesílatele. Obsah tohoto emailu i s přílohami a jeho kopie vymažte ze svého systému.
Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento email jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat.
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V případě, že je tento e-mail součástí obchodního jednání:
- vyhrazuje si odesílatel právo ukončit kdykoliv jednání o uzavření smlouvy, a to z jakéhokoliv důvodu i bez uvedení důvodu.
- a obsahuje-li nabídku, je adresát oprávněn nabídku bezodkladně přijmout; Odesílatel tohoto e-mailu (nabídky) vylučuje přijetí nabídky ze strany příjemce s dodatkem či odchylkou.
- trvá odesílatel na tom, že příslušná smlouva je uzavřena teprve výslovným dosažením shody na všech jejích náležitostech.
- odesílatel tohoto emailu informuje, že není oprávněn uzavírat za společnost žádné smlouvy s výjimkou případů, kdy k tomu byl písemně zmocněn nebo písemně pověřen a takové pověření nebo plná moc byly adresátovi tohoto emailu případně osobě, kterou adresát zastupuje, předloženy nebo jejich existence je adresátovi či osobě jím zastoupené známá.

This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients.
If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system.
If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner.
The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email.

In case that this e-mail forms part of business dealings:
- the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning.
- if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation.
- the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects.
- the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient.
______________________________________________
[hidden email] mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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Re: creating tables with replacement

David Carlson
Building on Petr's suggestion, you could modify his code to get all 10 samples at once in a compact format:

> Samples <- lapply(lll, function(x) replicate(10, sample(x, rep=TRUE)))
# Samples is a list containing 3 matrices, one for each group
# Each column gives the index (row) numbers for a particular sample
> str(Samples)
List of 3
 $ A: int [1:3, 1:10] 2 1 3 1 1 3 2 3 1 2 ...
 $ B: int [1:7, 1:10] 8 5 8 6 5 8 10 6 4 7 ...
 $ C: int [1:9, 1:10] 14 15 19 13 18 19 19 12 13 16 ...
# Row numbers for all 10 samples of 3 for group A
> Samples$A
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,]    2    1    2    2    3    3    2    3    2     3
[2,]    1    1    3    1    3    3    2    3    3     3
[3,]    3    3    1    2    2    1    2    3    3     1
# The first sample from group A
> dat1[Samples$A[ , 1], ]
  RegionA site temp group
2      Ra   s2   21     A
1      Ra   s1   23     A
3      Rb   s3   10     A

# Save the first sample from group A as a .csv file
> write.csv(dat1[Samples$A[ , 1], ], row.names=FALSE, file="Test.csv")

# Save all ten group A samples as a single .csv file
# Faster but you have to split them into separate tables by hand
> write.csv(dat1[Samples$A[ , 1:10], ], row.names=FALSE, file="Test.csv")

----------------------------------------
David L Carlson
Department of Anthropology
Texas A&M University
College Station, TX 77843-4352


-----Original Message-----
From: R-help [mailto:[hidden email]] On Behalf Of PIKAL Petr
Sent: Wednesday, October 18, 2017 3:38 AM
To: Marna Wagley <[hidden email]>; r-help mailing list <[hidden email]>
Subject: Re: [R] creating tables with replacement

Hi

maybe there is another more elegant solution but something like this

> idx <- 1:nrow(dat1)
> lll <- split(idx, dat1$group)
> dat1[unlist(lapply(lll, sample, rep=TRUE)),]

gives you selected rows.

You could use for cycle or save those data frames manually

Cheers

Petr

> -----Original Message-----
> From: R-help [mailto:[hidden email]] On Behalf Of Marna
> Wagley
> Sent: Wednesday, October 18, 2017 9:46 AM
> To: r-help mailing list <[hidden email]>
> Subject: [R] creating tables with replacement
>
> Hi R User,
> I am new in R and trying to create tables with selecting rows randomly
> (but with replacement) for each group but each group should have same
> number as original. Is it possible to create it using the following example data set?
>
> Your help is highly appreciated.
>
> dat1<-structure(list(RegionA = structure(c(1L, 1L, 2L, 3L, 3L, 4L,
>
> 5L, 5L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L), .Label = c("Ra",
>
> "Rb", "Rc", "Rd", "Re", "Rf"), class = "factor"), site =
> structure(c(1L,
>
> 12L, 13L, 14L, 15L, 16L, 17L, 18L, 19L, 2L, 3L, 4L, 5L, 6L, 7L,
>
> 8L, 9L, 10L, 11L), .Label = c("s1", "s10", "s11", "s12", "s13",
>
> "s14", "s15", "s16", "s17", "s18", "s19", "s2", "s3", "s4", "s5",
>
> "s6", "s7", "s8", "s9"), class = "factor"), temp = c(23L, 21L,
>
> 10L, 15L, 16L, 8L, 13L, 1L, 23L, 19L, 25L, 19L, 12L, 16L, 19L,
>
> 21L, 12L, 5L, 7L), group = structure(c(1L, 1L, 1L, 2L, 2L, 2L,
>
> 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L), .Label = c("A",
>
> "B", "C"), class = "factor")), .Names = c("RegionA", "site",
>
> "temp", "group"), class = "data.frame", row.names = c(NA, -19L
>
> ))
>
>
> Here group A has 3 rows,
>
> B had 7 rows, and
>
> C has 9 rows
>
>
> I want to select rows randomly (with replacement) for each group but
> each group should have same number of rows as above (group A=3 rows,
> B=7 rows, and
> c=9 rows). This way I want to create at least 10 tables (10 random
> tables) and save them separately in Excel.
>
>
> Thanks
>
>       [[alternative HTML version deleted]]
>
> ______________________________________________
> [hidden email] mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

________________________________
Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům.
Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně jeho odesílatele. Obsah tohoto emailu i s přílohami a jeho kopie vymažte ze svého systému.
Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento email jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat.
Odesílatel e-mailu neodpovídá za eventuální škodu způsobenou modifikacemi či zpožděním přenosu e-mailu.

V případě, že je tento e-mail součástí obchodního jednání:
- vyhrazuje si odesílatel právo ukončit kdykoliv jednání o uzavření smlouvy, a to z jakéhokoliv důvodu i bez uvedení důvodu.
- a obsahuje-li nabídku, je adresát oprávněn nabídku bezodkladně přijmout; Odesílatel tohoto e-mailu (nabídky) vylučuje přijetí nabídky ze strany příjemce s dodatkem či odchylkou.
- trvá odesílatel na tom, že příslušná smlouva je uzavřena teprve výslovným dosažením shody na všech jejích náležitostech.
- odesílatel tohoto emailu informuje, že není oprávněn uzavírat za společnost žádné smlouvy s výjimkou případů, kdy k tomu byl písemně zmocněn nebo písemně pověřen a takové pověření nebo plná moc byly adresátovi tohoto emailu případně osobě, kterou adresát zastupuje, předloženy nebo jejich existence je adresátovi či osobě jím zastoupené známá.

This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients.
If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system.
If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner.
The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email.

In case that this e-mail forms part of business dealings:
- the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning.
- if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation.
- the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects.
- the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient.
______________________________________________
[hidden email] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
[hidden email] mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
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Re: creating tables with replacement

Marna Wagley
Dear David and Petr,
It worked and I think now I can modify the code little bit to fit my
requirement. Thank you so much for your help.

Thanks,

MW

On Wed, Oct 18, 2017 at 7:15 AM, David L Carlson <[hidden email]> wrote:

> Building on Petr's suggestion, you could modify his code to get all 10
> samples at once in a compact format:
>
> > Samples <- lapply(lll, function(x) replicate(10, sample(x, rep=TRUE)))
> # Samples is a list containing 3 matrices, one for each group
> # Each column gives the index (row) numbers for a particular sample
> > str(Samples)
> List of 3
>  $ A: int [1:3, 1:10] 2 1 3 1 1 3 2 3 1 2 ...
>  $ B: int [1:7, 1:10] 8 5 8 6 5 8 10 6 4 7 ...
>  $ C: int [1:9, 1:10] 14 15 19 13 18 19 19 12 13 16 ...
> # Row numbers for all 10 samples of 3 for group A
> > Samples$A
>      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
> [1,]    2    1    2    2    3    3    2    3    2     3
> [2,]    1    1    3    1    3    3    2    3    3     3
> [3,]    3    3    1    2    2    1    2    3    3     1
> # The first sample from group A
> > dat1[Samples$A[ , 1], ]
>   RegionA site temp group
> 2      Ra   s2   21     A
> 1      Ra   s1   23     A
> 3      Rb   s3   10     A
>
> # Save the first sample from group A as a .csv file
> > write.csv(dat1[Samples$A[ , 1], ], row.names=FALSE, file="Test.csv")
>
> # Save all ten group A samples as a single .csv file
> # Faster but you have to split them into separate tables by hand
> > write.csv(dat1[Samples$A[ , 1:10], ], row.names=FALSE, file="Test.csv")
>
> ----------------------------------------
> David L Carlson
> Department of Anthropology
> Texas A&M University
> College Station, TX 77843-4352
>
>
> -----Original Message-----
> From: R-help [mailto:[hidden email]] On Behalf Of PIKAL Petr
> Sent: Wednesday, October 18, 2017 3:38 AM
> To: Marna Wagley <[hidden email]>; r-help mailing list <
> [hidden email]>
> Subject: Re: [R] creating tables with replacement
>
> Hi
>
> maybe there is another more elegant solution but something like this
>
> > idx <- 1:nrow(dat1)
> > lll <- split(idx, dat1$group)
> > dat1[unlist(lapply(lll, sample, rep=TRUE)),]
>
> gives you selected rows.
>
> You could use for cycle or save those data frames manually
>
> Cheers
>
> Petr
> > -----Original Message-----
> > From: R-help [mailto:[hidden email]] On Behalf Of Marna
> > Wagley
> > Sent: Wednesday, October 18, 2017 9:46 AM
> > To: r-help mailing list <[hidden email]>
> > Subject: [R] creating tables with replacement
> >
> > Hi R User,
> > I am new in R and trying to create tables with selecting rows randomly
> > (but with replacement) for each group but each group should have same
> > number as original. Is it possible to create it using the following
> example data set?
> >
> > Your help is highly appreciated.
> >
> > dat1<-structure(list(RegionA = structure(c(1L, 1L, 2L, 3L, 3L, 4L,
> >
> > 5L, 5L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L), .Label = c("Ra",
> >
> > "Rb", "Rc", "Rd", "Re", "Rf"), class = "factor"), site =
> > structure(c(1L,
> >
> > 12L, 13L, 14L, 15L, 16L, 17L, 18L, 19L, 2L, 3L, 4L, 5L, 6L, 7L,
> >
> > 8L, 9L, 10L, 11L), .Label = c("s1", "s10", "s11", "s12", "s13",
> >
> > "s14", "s15", "s16", "s17", "s18", "s19", "s2", "s3", "s4", "s5",
> >
> > "s6", "s7", "s8", "s9"), class = "factor"), temp = c(23L, 21L,
> >
> > 10L, 15L, 16L, 8L, 13L, 1L, 23L, 19L, 25L, 19L, 12L, 16L, 19L,
> >
> > 21L, 12L, 5L, 7L), group = structure(c(1L, 1L, 1L, 2L, 2L, 2L,
> >
> > 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L), .Label = c("A",
> >
> > "B", "C"), class = "factor")), .Names = c("RegionA", "site",
> >
> > "temp", "group"), class = "data.frame", row.names = c(NA, -19L
> >
> > ))
> >
> >
> > Here group A has 3 rows,
> >
> > B had 7 rows, and
> >
> > C has 9 rows
> >
> >
> > I want to select rows randomly (with replacement) for each group but
> > each group should have same number of rows as above (group A=3 rows,
> > B=7 rows, and
> > c=9 rows). This way I want to create at least 10 tables (10 random
> > tables) and save them separately in Excel.
> >
> >
> > Thanks
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > [hidden email] mailing list -- To UNSUBSCRIBE and more, see
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> > http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> ________________________________
> Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou
> určeny pouze jeho adresátům.
> Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě
> neprodleně jeho odesílatele. Obsah tohoto emailu i s přílohami a jeho kopie
> vymažte ze svého systému.
> Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento email
> jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat.
> Odesílatel e-mailu neodpovídá za eventuální škodu způsobenou modifikacemi
> či zpožděním přenosu e-mailu.
>
> V případě, že je tento e-mail součástí obchodního jednání:
> - vyhrazuje si odesílatel právo ukončit kdykoliv jednání o uzavření
> smlouvy, a to z jakéhokoliv důvodu i bez uvedení důvodu.
> - a obsahuje-li nabídku, je adresát oprávněn nabídku bezodkladně přijmout;
> Odesílatel tohoto e-mailu (nabídky) vylučuje přijetí nabídky ze strany
> příjemce s dodatkem či odchylkou.
> - trvá odesílatel na tom, že příslušná smlouva je uzavřena teprve
> výslovným dosažením shody na všech jejích náležitostech.
> - odesílatel tohoto emailu informuje, že není oprávněn uzavírat za
> společnost žádné smlouvy s výjimkou případů, kdy k tomu byl písemně zmocněn
> nebo písemně pověřen a takové pověření nebo plná moc byly adresátovi tohoto
> emailu případně osobě, kterou adresát zastupuje, předloženy nebo jejich
> existence je adresátovi či osobě jím zastoupené známá.
>
> This e-mail and any documents attached to it may be confidential and are
> intended only for its intended recipients.
> If you received this e-mail by mistake, please immediately inform its
> sender. Delete the contents of this e-mail with all attachments and its
> copies from your system.
> If you are not the intended recipient of this e-mail, you are not
> authorized to use, disseminate, copy or disclose this e-mail in any manner.
> The sender of this e-mail shall not be liable for any possible damage
> caused by modifications of the e-mail or by delay with transfer of the
> email.
>
> In case that this e-mail forms part of business dealings:
> - the sender reserves the right to end negotiations about entering into a
> contract in any time, for any reason, and without stating any reasoning.
> - if the e-mail contains an offer, the recipient is entitled to
> immediately accept such offer; The sender of this e-mail (offer) excludes
> any acceptance of the offer on the part of the recipient containing any
> amendment or variation.
> - the sender insists on that the respective contract is concluded only
> upon an express mutual agreement on all its aspects.
> - the sender of this e-mail informs that he/she is not authorized to enter
> into any contracts on behalf of the company except for cases in which
> he/she is expressly authorized to do so in writing, and such authorization
> or power of attorney is submitted to the recipient or the person
> represented by the recipient, or the existence of such authorization is
> known to the recipient of the person represented by the recipient.
> ______________________________________________
> [hidden email] mailing list -- To UNSUBSCRIBE and more, see
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> PLEASE do read the posting guide http://www.R-project.org/
> posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

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______________________________________________
[hidden email] mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.