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Description
JASP Version
0.19.3
Commit ID
No response
JASP Module
Reliability
What analysis are you seeing the problem on?
Split-half coefficient
What OS are you seeing the problem on?
Windows 10
Bug Description
in the classical unidimensional reliability option of the Reliability module, users can choose between the standardized and unstandardized version of their coefficients. however, it seems that the split-half coefficient is not responsive to this choice (and it seems to always reports the standardized version). this is probably not a software bug, but a psychometric oversight: just like there are two versions of alpha ("normal" alpha and standardized alpha, corresponding to the assumption of tau-equivalence and the assumption of parallellism, respectively), there are two versions of the split-half coefficient: guttman's lambda 4 and the spearman brown-coefficient, again corresponding to the assumption of tau-equivalence and the assumption of parallellism, respectively
see here from cho, 2016
Expected Behaviour
when a user wants the split half coefficient, report lambda 4 when unstandardized is selected, and report the spearman-brown coefficient when standardized is selected
Steps to Reproduce
just compute a split-half coefficient with any data set and check whether switching between standardized and unstandardized has any effect
Log (if any)
No response
More Debug Information
No response
Final Checklist
- I have included a screenshot showcasing the issue, if possible.
- I have included a JASP file (zipped) or data file that causes the crash/bug, if applicable.
- I have accurately described the bug, and steps to reproduce it.