eeramalho wrote:

>

> Thank you David. I got it now.

>

> Maybe you can help again.

>

> I am typing the following code to draw a QQ plot but the line does not look right?

>

> *******************

> qqnorm(cbiomass)

>

> qqline(cbiomass)

> ***********************

> the graph looks very different from the graph generated by SAS.

There are two possibilities:

1. you need to use the argument 'datax = TRUE'

2. SAS is wrong

You might also have a look at the qq.plot() function

in package 'car'.

-Peter Ehlers

>

> Thank you again.

>

> Emiliano.

>

> Date: Fri, 22 Jan 2010 21:32:26 -0800

> From:

[hidden email]
> To:

[hidden email]
> Subject: Re: Quartiles and Inter-Quartile Range

>

>

>

> It's looks like you think that type=2 are the 'true' quantiles, but the default method in R is type=7

>

>

> You might want to look at ?stats::quantile

>

>

> hth

>

> david freedman

>

>

>

>

>

> View message @

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> To unsubscribe from Quartiles and Inter-Quartile Range, click here.

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https://stat.ethz.ch/mailman/listinfo/r-help> PLEASE do read the posting guide

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University of Calgary

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