You can watch this excellent video on how to do median split. I also demonstrate how to conduct the analysis via the crosstabs. Doubleclick the variable gender to move it to the groups based on field. We recommend splitting a predictor into three parts and then coding the trichotomized variable as 1, 0, 1. This assumes that you are going to code values equal to the median as 1s. In this example, i split my file by gender so that i can analyse data for males and females separately. If you do this, youre probably doing the oldstandby maneuver known as the median split, which yields categorical data that you can subsequently jam into an anova. Learn how to split a data set in spss which allows for splitting the results output according to the levels associated with a particular variable.
Anotherchoiceforthe split point is the midpoint of the measurement scale of the measured variable. This split is in effect for the second frequencies procedure. One common approach is to split the scale at the sample median, thereby defining high and low groups on the variable in question. If you want to put values on the median in the lower group, then swap ge. Creating graphs in spss this tutorial will show you how to explore. Pdf best practices for using median splits, artificial. A researchers guide to regression, discretization, and.
The second split file command overrides the first command and splits the file by sex and race. How to split a numeric variable into a binary lowhigh. Split your data file by a categorical variable in spss youtube. Best practices for using median splits, artificial categorization, and their continuous alternatives article pdf available in journal of experimental psychopathology january 2011 with 5,011 reads. Problem is, you might be sacrificing a few things by virtue of the simplification involved in the categorical anova method. Spss for mac os x provides a user interface that makes statistical analysis more intuitive.
This allows the ease of interpretation of the median split you can just compare the upper to lower parts but at a great increase in efficiency. I demonstrate how to enter the data, run the analysis and interpret the output. The first split file command applies to the first frequencies procedure. To split the data in a way that separates the output for each group. Hi all, im a final year student looking at selfefficacy scores of student teachers and im looking at splitting the scale data into a high versus low group.