Analysis of Covariance (ANCOVA)

2022

One-way ANCOVA with SPSS 28: video , SPSS data , Powerpoint

Testing assumption of homogeneity of regression slopes (and what you might do if the assumption is violated): video , SPSS data

On the question of what you might do, in the video I reference the possibility of performing moderated multiple regression using Hayes Process macro in SPSS. Here is a link to the macro page: link . Here is a link to another video of mine using the macro for performing moderated regression: link

2020

One-way analysis of covariance (March 2020): video, SPSS data, Powerpoint

2019

Powerpoint (overview of ANCOVA and demonstrations); new, 2019): presentation (links to the data are provided in the slideshow)

One-way ANCOVA with Bonferroni-adjusted post hoc tests (new, 2019): video, SPSS data

One-way ANCOVA with planned contrasts using LMATRIX commands (new, 2019; continuation from above): video, SPSS data

Factorial ANCOVA with simple effects tests (new, 2019): video, SPSS data

Testing for homogeneity of regression slopes (new, 2019): video, SPSS data, Powerpoint

One-way ANCOVA (older demo): video, SPSS data

Managing problem in SPSS version 25 with Levene's test/Homogeneity test: video, SPSS data (The video covers a problem - https://developer.ibm.com/answers/questions/452772/unrecoverable-application-error-in-the-statistics-4/ - that can occur if you have not installed a "fix" - from IBM. It also provides a computational solution to obtaining Levene's test results)