100+ Inverse variance weights PowerPoint (PPT) Presentations, Inverse variance weights PPTs

Inverse variance weights - PowerPoint PPT Presentation

Heterogeneity in Hedges

Heterogeneity in Hedges. Homogeneity Test . When the null (homogeneous rho ) is true, Q is distributed as chi-square with ( k -1) df , where k is the number of studies. This is a test of whether Random Effects Variance Component is zero. Q.

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285 views • 9 slides

Combining Effect Sizes

Combining Effect Sizes. What to Combine? How to do it?. What to Combine? (1). Whether effect sizes can/should be combined is controversial Safe if studies are replications (identical IV, DV, design, only difference is observations)

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234 views • 9 slides

Combining Effect Sizes

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189 views • 9 slides

Combining Effect Sizes

Combining Effect Sizes. Taking the Average. How to Combine (1). Take the simple mean (add all ES, divide by number of ES). M=(1+.5+.3)/3 M = 1.8/3 M=.6. Unbiased, consistent, but not efficient estimator. But see Bonnet for an argument for using unit wts. How to Combine (2).

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114 views • 5 slides

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Inverse variance weights - PowerPoint PPT Presentation

Heterogeneity in Hedges

Combining Effect Sizes

Combining Effect Sizes

Combining Effect Sizes