0
votes
0answers
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 ...
0
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0answers
5 views

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 ...
2
votes
1answer
32 views

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 ...
0
votes
2answers
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 ...
0
votes
0answers
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 ...
1
vote
2answers
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 ...
4
votes
1answer
682 views

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 ...
3
votes
2answers
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 ...
2
votes
3answers
20k views

AVE & composite reliability with SPSS

I have some issues with an exploratory factor analysis. Can anybody please tell me how to calculate the Average Variance Extracted (AVE) and the Composite Reliability from two factors, each with ...
3
votes
1answer
8k views

Inter-rater reliability using Intra-class correlation with ratings for multiple objects on multiple properties

Initial Question: I am trying to calculate inter-rater reliability. Previous researchers in this area have used intraclass correlation. SPSS has options for two-way random, mixed random and one-way ...