Compare two observations of a continuous outcome after meeting statistical assumptions
The steps for conducting a repeated-measures t-test in SPSS
2. Click Analyze.
3. Drag the cursor over the Compare Means drop-down menu.
4. Click on Paired-Samples T Test.
5. Click on the first observation of the continuous outcome.
7. Click on the arrow button to move the first observation of the outcome variable into the Test Pairs box under the Variable1 column.
8. Click on the second observation of the continuous outcome.
9. Click on the arrow button to move the second observation of the outcome variable into the Test Pairs box under the Variable2 column.
10. Click OK.
The steps for interpreting the SPSS output for a repeated-measure t-test
2. In the Paired Samples Test table, look at the p-value associated with Sig. (2-tailed) column. This is the p-value that is interpreted.
If it is LESS THAN .05, then researchers have evidence of a statistically significant difference in the continuous outcome across time or within-subjects.
If the p-value is MORE THAN .05, then researchers have evidence that there is NOT a statistically significant difference in the continuous outcome across time or within-subjects.
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