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Help desk => Questions and Answers => Topic started by: sanei on May 08, 2012, 06:43:57 AM

Dear professor
For the MNSQ fit statistics you provide a ninetyfive percent confidence interval for the expected value of the MNSQ in ConQuest. Is it possible I provide confidence intervals with other percent?
I need a confidence interval that equal to (0.7 , 1.3).
I wonder if I can ask you to help me.
Best regards
E.sanei


Sanei,
for the MNSQ confidence intervals normality is assumed because the degrees for freedom is (typically very)large. Under the null hypothesis of model fit the MNSQ has an expecation of 1 and a variance that is computed internally, but not actually printed by ConQuest 3.0. To obtain this number you could subtract the lower 95% CI value from one and divide by 1.96 to get the SE. The to get an alternative find the appropriate nornmal deviate (eg 1.645 for a 90% interval) multiply that by the CI obtained above and substract from 1.0 for lower bound and add to 1.0 for the upper bound.
OK?
Ray

you are wright.
thank you so much for your help.