I'm using SPSS V.26 and need to bootstrap data in the analyses of GLM Repeated Measures. However, I can't find the option for it in the program.

I am aware that there were problems related to bootstrapping in the previous version, 25, although it is not certain that the problems were also included for GLM Repeated Measures. Comparing versions 25 and 26, the options included in the analysis are exactly the same, thus I'm wondering if I can use bootstrap in GLM Repeated Measures in SPSS.

The graphical interface for GLM Repeated Measures does not allow specification of bootstrap sampling. It is possible to create syntax and precede it with a BOOTSTRAP command. It will run, but the only bootstrapped results will be for the parameter estimates, which are the same as with a multivariate analysis without repeated measures (since GLM uses the multivariate general linear model approach to repeated measures, which fits the same overall model as a multivariate model, and creates tests specific to repeated measures after the estimation).

Thank you for your kind information. Then, do you mean that I can or should try a multivariate analysis instead of using a bootstrap command in GLM Repeated Measures?

Otherwise, if I should try using a BOOTSTRAP command by creating syntax in GLM, can you let me know more details? I've found the following webpage for the example command, but I'm not sure if it is applicable to my case: https://www.ibm.com/docs/en/spss-statistics/24.0.0?topic=bootstrap-examples-command#syn_bootstrap_examples

You're welcome. There's really not a facility for directly producing tests on repeated measures in GLM with bootstrapping.