Reliability.

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Presentation transcript:

Reliability

How to test Repeat the same test with the same group Use the same test with different group In general Observe = True + Error Reliability = Var(True) / Var(Error) Data Quantitative – Scale and Ratio Ordinal Scale

Quantitative (Pearson correlation)

Ordinal Scale (Spearman Rank Correlation)

Split – Half Method (Spearman Brown)

Cronbachs’ Alpha Coefficient This value is minimum of reliability of True Component. The Cronbaschs’s alpha will increase when question increases.

Kuder – Richardson (For Dichotomous) K-R20 K-R21

From SPSS (Example_Reliability)

Assignment Test the reliability of important variables (Key variable) using the different style of correlation. Collect more data and check reliability again.