[R] djustment values not defined

[David Winsemius]

On Jun 17, 2009, at 12:35 PM, amor Gandhi wrote:

> Hello,
>
> I am using
> mod1 <- lrm(y~x1+x2,na.action=na.pass,method="lrm.fit")
> summary(mod1)
> and I've got the following error:
> Error in summary.Design(mod1) : adjustment values not defined here  
> or with datadist for x1 x2
>

Several of the useful features of the Design/Hmisc function set depend  
on having the datadist option defined. My encounters with failing to  
meet that expectation usually occur when I go to plot an interaction  
surface with plot.Design(). In my experience some functions work  
better if the data is passed in a dataframe. but the docs for datadist  
do not imply this to be a requirement.

What do you get if you try:

df1 <- data.frame(y=y, x1=x1, x2=x2)  # might not be necessary
dd=datadist(df)                       # might work with  
datadist(y,x1,x2)
options(datadist="dd")
mod1 <- lrm(y~x1+x2,na.action=na.pass, data=df1, method="lrm.fit")
# or  mod1 <- lrm(y~x1+x2,na.action=na.pass, method="lrm.fit")

summary(mod1)

-- 
David Winsemius, MD
Heritage Laboratories
West Hartford, CT