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Measurement invariance with binary data |
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Message/Author |
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ffan posted on Tuesday, July 15, 2014 - 8:24 pm
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Hi, I am doing a six-group measurement invariance study. I compared the configural model with the fully constrained model, finding out that there is no full measurement invariance. Then I am detecting partial invariance and try to find out which item(s) shows measurement noninvariance by comparing the configural model to a scalar model by freeing an item at a time (altogether I have 21 items), but I keep getting warning messages as follows: CORRELATION MATRIX (WITH VARIANCES ON THE DIAGONAL) ITEM21 ________ WARNING: THE BIVARIATE TABLE OF ITEM17 AND ITEM8 HAS AN EMPTY CELL. WARNING: THE BIVARIATE TABLE OF ITEM17 AND ITEM14 HAS AN EMPTY CELL. WARNING: THE BIVARIATE TABLE OF ITEM17 AND ITEM12 HAS AN EMPTY CELL. THE MODEL ESTIMATION TERMINATED NORMALLY THE CHI-SQUARE COMPUTATION COULD NOT BE COMPLETED BECAUSE OF A SINGULAR MATRIX. I do not know how I should handle this. Any suggestions would help. Thanks. |
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You want to avoid empty cell situations, so try deleting item 17 which is mentioned in all 3 messages. |
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