Questions tagged [item-analysis]
Item analysis is the process by which responses to a test are used to assess the overall quality of the test, and the quality of the items comprising the test.
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Item sampling techniques to reduce processing time for questionnaire
I have a well-crafted draft of a questionnaire, containing 240 items. The average processing time is 20 secs per item, so the entire questionnaire would take around 1 hour 20 min to complete. I want ...
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How to identify careless responders when items negatively correlate with the total scale
I'm calculating the Cronbach's alpha on a dataset with the scores of the Coping Orientations to the Problems Experienced (COPE-NVI-25) with the R package psych. I ...
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Low internal consistency
I am currently analyzing the data for a survey I have completed. In doing so, one question is quite simple (nominal) and require a typical “I do/I do not” and “I do not/I do” response from the ...
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What are the most important components of an item analysis of a MCQ exam?
I'm analyzing results of undergraduate exams that range from 60 to 100 multiple choice questions. The number of students doing any given exam ranges from ~70 to ~1000. In all cases students select ...
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What do bad infit and outfit in dichotomous Rasch model signify?
I'm really a beginner with Psychometry. We've just started psychometry in our college and I've used software Jamovi for that purpose.
Working with Dichotomous Rasch models to asses a Multiple choice ...
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DIF: validity of carrying out a t-test on the final sample?
I have run a DIF analysis of a questionnaire, to see how autistic men and women answer differently, with a total sample of 530 autistic men and 530 autistic women. I have a general hypothesis that the ...
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DIF: match sample randomly or by age?
I am carrying out a DIF analysis comparing the scores of men and women on a questionnaire. A preliminary ANOVA revealed that when comparing total scores on the test, there is a significant effect of ...
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Accounting for measurement Bias across manufacturers and multiple treatments
I've been trying to figure out the appropriate statistical approach for the following problem from work (simplified here):
I've got 5 manufacturers of a drug and each manufacturer makes their own ...
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Internal consistency
I have to analyse a dataset in which there are drugs and used animals based on article review. The datasets looks like this:
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Handful of IRT scores all exactly the same value
I am using the mirt package in R to model some latent variables. They seem to be working fine, except that a bunch of the scores generated are exactly the same. Most of the scores are within two or ...
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