Reliability and validity of questionnaire on SPSS

Internal reliability through Cronbach alpha should be .70 and above.
Interclass Correlation Coefficient (ICC) analysis (the closer to 1, the better)
One-way random effects model: where only the effects attributable to subjects (people) are considered random,
Two-way mixed effects model: where the effects due to subjects (people) are treated as random and the effects due to measures are considered fixed. This type of model is often used when assessing the consistency of measurements across different conditions or times, with a fixed set of measurement tools or methods.
Two-way random effects model: both people and measures effects as random
Overall interpretation: ICC closer to 1 the better
ICC or interclass correlation coefficient
Correlation for convergent validity
Correlation with confidence intervals on SPSS 28 and above
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