UF STA 6127 - 2-Sample t-test – Independent Samples (17 pages)

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2-Sample t-test – Independent Samples



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2-Sample t-test – Independent Samples

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Pages:
17
School:
University of Florida-Gainesville
Course:
Sta 6127 - Statistical Methods in Social Research II
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2 Sample t test Independent Samples Dataset Cloud Seeding Experiment Dependent Variable Rain gage Depth mm of rainfall in cloud seeded test area Independent Variable Seeded Not seeded on that day Seed 1 if Yes 0 if No SPSS Instructions Enter data in two columns One for Seed and other for Depth Using Variable View NAME the variables e g Seed Depth Using Variable View assign VALUES to the Seed variable e g 1 Seeded 0 Unseeded Return to Data View and Select ANALYZE COMPARE MEANS INDEPENDENT SAMPLES t TEST Select a Test Variable e g Depth Select a Grouping Variable e g Seed Define Groups e g 1 0 Source J Meit n W Woodley J Flueck 1984 Exploration of Extended Area Treatment Effects in FACE 2 Using Satellite Imagery Journal of Climate and Applied Meteorology pp 63 Paired t test Dependent Samples Dataset Botox for Migraine Headaches Dependent Variable Headache Frequency per Month Independent Variable Botox Condition Pre Post Treatment SPSS Instructions Enter data in 3 columns one for subject id one for pre treatment headache frequency and one for post treatment headache frequency Using Variable View Name the variables e g id Pre Post Return to Data View and Select ANALYZE COMPARE MEANS PAIRED SAMPLES t TEST Select 2 Paired Variables e g Pre and Post Source R Behmand T Tucker and B Guyuron 2003 Single Site Botulinum Toxin Type A Injection for Elimination of Migraine Trigger Points Headache Vol 43 10851089 Fisher s Exact Test Dataset Antiseptic as Treatment for Amputation In Contingency Table Form Dependent Variable Occurrence of Death among upper limb amputees 1 Death 0 Survive Independent Variable Period of Surgery 1 Post Discovery of Antiseptic 0 Pre SPSS Instructions Enter data in 3 columns Death status antiseptic status number of cases Using Variable View NAME the variables e g Death Antiseptic Cases Using Variable View assign VALUES to the Death and Antiseptic Variables variable e g 1 Yes 0 No Return to Data View and Select DATA WEIGHT CASES Click on Weight Cases by Select the variable Cases ANALYZE DESCRIPTIVE STATISTICS CROSSTABS Select Antiseptic as Rows Select Death as Columns Click on Statistics and click on Chi Square Source J Lister 1870 Effects of the Antiseptic System of Treatment on the Salubrity of a Surgical Hospital The Lancet 1 4 6 40 42 McNemar s Test Dataset Silicone Breast Implant Ruptures In Contingency Table Form Dependent Variable Rupture Leak Reporting Status in surgery on silicone gel breast implants 1 Yes 0 No Independent Variable Reporter 1 Self Report 2 Surgical Record SPSS Instructions Enter data in three columns Self Report Surgical Record Number of cases Using Variable View Name the Variables e g Self Surgical Cases Using Variable View Asssign Values to the levels of the variables e g 1 Yes 0 No Return to Data View and Select DATA WEIGHT CASES Click on Weight Cases by Select the variable Cases ANALYZE DESCRIPTIVE STATISTICS CROSSTABS Select Self as Rows Select Surgical as Columns Click on Statistics and click on McNemar Source Brown and Pennello 2002 Replacement Surgery and Slicone Breast Implant Rupture Journal of Women s Health Gender Based Medicine Vol 11 pp255 264 Chi Squared Test for Independence Dataset Union Army Deaths by Rank and Duty In Contingency Table Form Dependent Variable Mortality status for Union troops during Civil War 1 Died during war 0 survived war Independent Variable Rank Duty staus 1 Private Infantry 2 Private Noninfantry 3 Officer Infantry 4 Officer Noninfantry SPSS Instructions Enter data in 3 columns rank duty status mortality status number of cases Using Variable View Name the Variables e g rankduty Death Cases Using Variable View Asssign Values to the levels of the variables Return to Data View and Select DATA WEIGHT CASES Click on Weight Cases by Select the variable Cases ANALYZE DESCRIPTIVE STATISTICS CROSSTABS Select rankduty as Rows Select Death as columns Click on Statistics and click on Chi Square Click on Cells and click on Expected Column Percentages Conditional Marginal Distributions of Death Survive for each rank duty group Adj Standardized Residuals adjusted residuals for each cell Source C Lee 1999 Selective Assignment of Military Positions in the Union Army Implications for the Impact of the Civil War Social Science History Vol 23 pp 67 97 Measures of Association for Ordinal Variables Dataset Price and Quality Ratings In Contingency Table Form Dependent Variable Beer drinker s assessment of beer taste 0 undrinkable 1 Poor 2 Fair 3 Good 4 Very Pleasant Independent Variable Price condition assigned to beer pre tasting 1 Low 2 Medium 3 High SPSS Instructions Enter data in 3 columns Price Condition Taste Quality number of cases Using Variable View Name the Variables e g Price Taste Cases Using Variable View Assign Values to the levels of the variables Return to Data View and Select DATA WEIGHT CASES Click on Weight Cases by Select the variable Cases ANALYZE DESCRIPTIVE STATISTICS CROSSTABS Select price as Rows Select taste as columns Click on Statistics and click on Ordinal Measures Gamma and Kendall s Tau b Source McConnell 1968 An Experimental Evaluation of the Price Quality Relationship The Journal of Business Vol 41 pp439 444 Simple Linear Regression Dataset Tombstone Weathering Dependent Variable Tombstone Surface Recession Rate Independent Variable 100 Year Mean SO2 concentration SPSS Instructions Enter data into 2 columns SO2 Concentration Tombstone Recession Rate Using Variable View Name the variables e g so2 recrate Return to Data View and Select GRAPHS To obtain Plot with Fitted Equation INTERACTIVE SCATTERPLOT Move recrate to vertical up down axis Move so2 to horizontal right left axis Click on Fit tab Select Regression as Method ANALYZE To fit Model REGRESSION LINEAR Identify recrate as Dependent Variable Identify so2 as Independent Variable TRANSFORM To make log transformation on recrate COMPUTE Select a name for Target Variable e g logrrate Give instructions e g logrrate log logrrate Repeat Process for Graph and Model fit Source Meierding 1993 Marble Tombstone Weathering and Air Pollution in North America Annals of the Association of Geographers Vol 83 4 pp 568 588 Multiple Linear Regression Dataset Japanese Emigration to Pacific Northwest 1880 1915 Dependent Variable Emigrants per 1 million residents Independent Variables land tenant farmers change in ratio of tenant farmlands average farm area government laborers in Hawaii existence of pioneer immigrants SPSS Instructions Enter data into 6 columns


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