[R] djustment values not defined

[David Winsemius]

On Jun 17, 2009, at 1:03 PM, David Winsemius wrote:

>
> 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)
             ^df1^
> 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