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Sample Size Calculation with R

Sample size Calculation with RDr. Mark Williamson, StatisticianBiostatistics, Epidemiology, and Research Design Core DaCCoTAPurpose This Module was created to provide instruction and examples on Sample size calculations for a variety of statistical tests on behalf of BERDC The software used is R a free, open-source packageBackground The Biostatistics, Epidemiology, and Research Design Core (BERDC) is a component of the DaCCoTA program Dakota Cancer Collaborative on Translational Activity has as its goal to bring together researchers and clinicians with diverse experience from across the region to develop unique and innovative means of combating cancer in North and South Dakota If you use this Module for research, please reference the DaCCoTA projectThe Why of Sample size Calculations In designing an experiment, a key question is:How many animals/subjects do I need for my experiment?

1 One Mean T-test Yes pwr pwr.t.test 2 Two Means T-test Yes pwr pwr.t.test 3 Paired T-test Yes pwr pwr.t.test 4 One-way ANOVA Yes pwr pwr.anova.test 5 Single Proportion Test Yes pwr pwr.p.test 6 Two Proportions Test Yes pwr pwr.2p.test 7 Chi-Squared Test Yes pwr pwr.chisq.test 8 Simple Linear Regression Yes pwr pwr.f2.test 9 Multiple Linear ...

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Sample Size Calculation - University of North Dakota

med.und.edu

Dakota Cancer Collaborative on Translational Activity has as its goal to bring together researchers and clinicians with diverse experience from across the region to develop unique and innovative means of combating cancer in North and South Dakota If you use this Module for research, please reference the DaCCoTA project

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Data Analysis using SPSS - University of North Dakota

med.und.edu

– Variable View – Data View SPSS gives a lot of information, most which you don’t need – Ignore what you don’t need 1. Start SPSS from wherever you have it 2. Double click New Dataset at the top left 3. In the box on the right there are 10 people’s names, type them into the first column 4. You may notice a problem when you get to Peter.

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med.und.edu

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Chapter 7 Statement of Your Current Monthly Income and Means Test Calculation (Official ... Calculation of Commitment Period and Chapter 13 Calculation of Your Disposable Income (Official Forms 122C–1 and 122C–2)..... 34 Statement of Intention for Individuals Filing Under Chapter 7 (Official Form 108)..... 35 Application for Individuals to ...

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Sample Size Calculation - University of North Dakota

med.und.edu

# Name of Test Numeric. Var(s) Cat. Var(s) Cat. Var Group # Cat Var. # of Interest Parametric Paired 1 One Mean T-test 1 0 0 0 Yes N/A 2 One Mean Wilcoxon Test 1 0 0 0 No N/A 3 Two Means T-test 1 1 2 1 Yes No 4 Mann-Whitney Test 1 1 2 1 No No 5 Paired T-test 1 1 2 1 Yes Yes 6 Paired Wilcoxon Test 1 1 2 1 No Yes 7 One-way ANOVA 1 1 >2 1 Yes No

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www3.nd.edu

Therefore, you want to simultaneously investigate differences between the means of several populations. C. To do this, you use ANOVA - Analysis of Variance. ANOVA is appropriate when T You have a dependent, interval level variable T You have 2 or more populations, i.e. the independent variable is categorical. In

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