Measurement and Statistics_Dasch_Date__031510

# Measurement and Statistics_Dasch_Date__031510 - Exploring...

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Exploring Assumptions (continued) Assumptions of parametric tests - normally distributed data sampling distribution errors in the model Assessing homogeneity of variance - Levene test tests is variance in different groups are the same if significant variances are not equal not significant variances are equal Variance ratio or Hartley’s F - with 2 or more groups - VR = largest variance/smallest variance - If VR < 2, homogeneity can be assumed - table 5.12 in table Transformations must be applied to every variable (READ SECTION IN BOOK) - log transformation log(x) correct for: positive skew, unequal variances - square root transformation SQUAREROOT(x) correct for: positive skew, unequal variances - reciprocal transformation (1/x) corrects for: positive skew, unequal variances

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- reverse score transformation corrects for: negative skew SPSS K-S test: analyze descriptive stats
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