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Data read problems
Confirmatory Factor Analysis
posted on Tuesday, March 25, 2008 - 7:52 am
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 - 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
. I suggest updating to Version 5.
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