# Tagged Questions

34 views

### Using Cronbach's alpha to test reliability of a questionnaire

I administer a questionnaire to managers asking them to what extent they agree / disagree that they perform certain functions (listed in the questionnaire) on a scale of 1-5. The sample functions are ...
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### Reliability estimate for each item (comparing raters to each other)

I am working with a 15 item scale of pre-school teaching. Five observers observed 58 teachers. Its a complete crossed matrix i.e, all raters observed all teachers. In an attempt to weed out the weak ...
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### How to create an “alignment” variable from mutual rating variables

I want to create an "alignment" variable out of two other variables. Meaning, that if two raters (say manager and employee) rate each other similarly, alignment is high, but if they rate each other ...
9k views

### What am I supposed to do if Cronbach's alpha is negative?

I have gathered data from 130 questionnaires and I have 30 variables. Cronbach's alpha is badly negative. I have checked everything I could think of, but the result did not change. SPSS file is ...
341 views

### Is it necessary to calculate Cronbach’s alpha for each sub-test?

I have a data set that includes two sub-tests, each measured using a Likert scale. I want to test the reliability. Is it necessary to calculate Cronbach’s Alpha for each sub-test? Or do I have to ...
2k views

### Cronbach's alpha continuous and dichotomous data in SPSS

I have one question about using SPSS to calculate Cronbach's alpha of a measure that draws on two types of items: one yields ordinal data and the other dichotomous. The ordinal data are produced ...
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### Interrater reliability in SPSS

I am trying to calculate interrater reliability in SPSS for both pre and post test of the same measure that is administered as part of a prison intake program. The measure has 20 items and then a ...
7k views

### How to compute the standard error of measurement (SEM) from a reliability estimate?

SPSS returns lower and upper bounds for Reliability. While calculating the Standard Error of Measurement, should we use the Lower and Upper bounds or continue using the Reliability estimate. I am ...