I should say that in making up sequences of tasks, we have trouble especially with vignettes in controlling all the other variables.?So we do get compression and overlapping until we fix them.?Sometimes it is obvious what the problem is.?
There is anther common problem.?There are so few people performing at the metasystematic stage, that the Rasch Analysis sometimes does not give reliable results.?Remember, systematic is about 1.5% of the population.?So even with a 100 of on line participants with an average stage of formal, there are just a few.?I will make up a series of tests.
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