Baseline median
Establish baseline of an ordinal outcome
For a within-subjects design, a baseline measure of an ordinal variable is measured using a median and interquartile range. This baseline measure can be used as a descriptive variable or as a control that future observations will be compared against.
The steps for conducting baseline median statistics in SPSS
1. The data is entered in a within-subjects fashion.
2. Click Analyze.
3. Drag the cursor over the Descriptive Statistics drop-down menu.
4. Click Explore.
5. Click on the categorical outcome variable to highlight it.
6. Click on the arrow to move the variable into the Dependent List: box.
7. Click OK.
2. Click Analyze.
3. Drag the cursor over the Descriptive Statistics drop-down menu.
4. Click Explore.
5. Click on the categorical outcome variable to highlight it.
6. Click on the arrow to move the variable into the Dependent List: box.
7. Click OK.
The steps for interpreting the SPSS output for baseline median statistics
Here is how to interpret the SPSS output:
1. Look in the Descriptives table, in the Median row. This is the baseline median value for the sample.
1. Look in the Descriptives table, in the Median row. This is the baseline median value for the sample.
Click on the Download Database and Download Data Dictionary buttons for a configured database and data dictionary for baseline median statistics.
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