[R] Regression with factor having1 level

[peter dalgaard]

> On 11 Mar 2016, at 02:03 , Robert McGehee <rmcgehee at gmail.com> wrote:
> 
>> df <- data.frame(y=c(0,2,4,6,8), x1=c(1,1,2,2,NA),
> x2=factor(c("A","A","A","A","B")))
>> resid(lm(y~x1+x2, data=df, na.action=na.exclude)

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Peter Dalgaard, Professor,
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