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Spearman's Rank Correlation - Video Tutorial with Dr Iain Weir
In this video Dr Iain Weir (University of the West of England) explains when you should use SPEARMAN'S RANK correlation coefficient (rather than the usual Pearson Correlation Coefficient). He also shows how to calculate it using SPSS and also a calculator, and how to intrepret the value of the coefficient and test its significance. A written introduction using the same examples is available as a Quick Reference resource at this site. You could also use the Test Yourself Quiz after reviewing this video.
Testing Normality in SPSS
A short video tutorial to demonstrate how to test the normality of data using SPSS. This resource has been made available under a Creative Commons licence by Kristian Evans, Swansea University.
The Sign Test (Worksheet)
The Sign test can be used in place of a paired t-test when your data are either ordinal or the assumption of normality is in doubt. Note however that the Wilcoxon Signed Rank test is often preferred in this case! This teach yourself worksheet provides an introduction to the Sign test including how to do this using SPSS. Note: The "Analyze"--> "Nonparametric Tests"-->"2 Related Samples" step in SPSS (see page 2) has now been changed to Analyze"--> "Nonparametric Tests"-->"LEGACY DIALOGS"-->"2 Related Samples"
Two-Way Analysis of Variance (Worksheet)
This teach yourself worksheet looks at the use of Analysis of Variance when you have two factors (categorical grouping variables). This also includes infomation on how to do this using SPSS. Note that the SPSS data set battery.sav referred to in the worksheet is also available here.
Two-Way Analysis of Variance (Worksheet) Data Set battery.sav
This is a zip file containing the SPSS data set called battery.sav for use with the Two-Way Analysis of Variance Worksheet. Note: please save this file to your PC before extracting its contents.
Use 'Split file' to analyse groups separately in SPSS
How to use 'Split file' to analyse groups separately in SPSS. By using the Split file tool, SPSS will analyse groups of a categorical variable separately. E.g. split your file by gender to analyse males and females separately. This will not physically split your file - all your data stays in the same place. This resource from the "SPSS Tutorial Series" is contributed to the statstutor Community project by Christine Pereira, Brunel University and reviewed by Tim Sparks, Coventry University. It was developed with sigma resource development funding.
Wilcoxon Mann-Whitney Tests (Worksheet)
The Wilcoxon Mann-Whitney test can be used instead of an independent (unpaired) samples t-test when your data are either ordinal or the assumption of normality is in doubt. This teach yourself worksheet provides an introduction to the Mann-Whitney test including how to do this using SPSS. Note: The "Analyze"--> "Nonparametric Tests"-->"2 Independent Samples" step in SPSS (see page 3) has now been changed to Analyze"--> "Nonparametric Tests" -->"LEGACY DIALOGS"-->"2 Independent Samples"
Wilcoxon Signed Rank Test (Worksheet)
The Wilcoxon Signed Rank test can be used instead of a paired t-test when your data are either ordinal or the assumption of normality is in doubt. This teach yourself worksheet provides an introduction to the Wilcoxon Signed Rank test including how to do this using SPSS. Note: The "Analyze"--> "Nonparametric Tests"-->"2 Related Samples" step in SPSS (see page 3) has now been changed to Analyze"--> "Nonparametric Tests"-->"LEGACY DIALOGS"-->"2 Related Samples"

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