On Jun 29, 2010, at 1:10 PM, GL wrote:

>

> dbs is an existing dataframe. I fit a lm and looked at influential

> observations. I want now to delete the influential observations from

> dbs,

> fit another lm, and see how different the results are. What is the

> syntax to

> remove the influential observations from dbs?

>

> fit <- lm(NI ~ PG + log(TG), data=dbs)

> fit.influential.observations <- influence.measures(fit)

>

> dbs.without.influential.observations <- ?????

>

Look (more?) carefully at the examples on the help page. The first

example shows how to extract a vector of row numbers associated with

infuential cases. If you need help applying htat information to a

dataframe using "[" then you probably need to re-read the Introduction

to R as well.

--

David Winsemius, MD

West Hartford, CT

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