Calculating sample size for means
Afshin Ostovar
Bushehr University of Medical Sciences
Principles of Sample Size
1. Variability
2. Effect size
3. Significance level
4. Power of the test
5. Type of the test
Type of the test Estimation of a mean
Comparing with a constant
Comparing two independent means
Comparing two dependent means
Comparing many independent means
Type of the test Estimation of a mean
Comparing with a constant
Comparing two independent means
Comparing two dependent means
Comparing many independent means
Estimation of mean
VariabilitySignificance Level
Difference
Standardized effect size
Type of the test Estimation of a mean
Comparing with a constant
Comparing two independent means
Comparing two dependent means
Comparing many independent means
Comparing with a constant
Variability
Difference
Standardized effect size
Significance Level
Power of the Test
Type of the test Estimation of a mean
Comparing with a constant
Comparing two independent means
Comparing two dependent means
Comparing many independent means
Comparing two independent groups
Variability
Difference
Standardized effect size
Significance Level
Power of the Test
Mean in group 1
Mean in group 2
Type of the test Estimation of a mean
Comparing with a constant
Comparing two independent means
Comparing two dependent means
Comparing many independent means
Comparing Dependent Means
Variability
Difference
Standardized effect size
Significance Level
Power of the Test
Comparing Dependent Means
Variability
Difference
Standardized effect size
Significance Level
Power of the Test
Mean in group 1
Mean in group 2
Type of the test Estimation of a mean
Comparing with a constant
Comparing two independent means
Comparing two dependent means
Comparing many independent means
Comparing many independent means
1. Calculate effect size: d = δ/σ
2. Adjustment to formula
Adjustment of effect size
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