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Mplus Discussion > Confirmatory Factor Analysis >
 Mark Kramer posted on Tuesday, March 25, 2008 - 12:52 pm

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:

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:

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.

 Linda K. Muthen posted on Tuesday, March 25, 2008 - 1:31 pm
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 I suggest updating to Version 5.
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