Data read problems PreviousNext
Mplus Discussion > Confirmatory Factor Analysis >
Message/Author
 Mark Kramer posted on Tuesday, March 25, 2008 - 7:52 am
Hi,

I'm using version 4.2 and recently have had difficulty with data read errors. It seems that the program stops reading after x number of variables, depending on the application.

For example, in running a one-factor CFA with 154 polytomous items, the item variances after item 75 read a variance of zero. The error given is:

*** ERROR
One or more variables have a variance of zero. Check your data and format statement.

Secondly, in running a 2-parameter IRT, the 126th variable is read incorrectly. The error given is:

*** ERROR
Categorical variable PPI121 contains less than 2 categories.

If I do not include this specific variable, I get the same error for the subsequent variable.

Any help would be appreciated.

Thanks,
Mark
 Linda K. Muthen posted on Tuesday, March 25, 2008 - 8:31 am
It sounds like because of listwise deletion, you end up with no variance or only one category of a variable. If you can't figure this out, send your input, data, output, and license number to support@statmodel.com. I suggest updating to Version 5.
Back to top
Add Your Message Here
Post:
Username: Posting Information:
This is a private posting area. Only registered users and moderators may post messages here.
Password:
Options: Enable HTML code in message
Automatically activate URLs in message
Action: