Assignment 4: Repeated measures studies

Overview

This report has two parts. In part 1, use the ten_vs_thirty.xlsx data set and answer the question “what should be the recommended intensity for strength development?”. In the second part, use strengthTests.csv and answer the question “what should be the recommended volume (one or three sets) for strength development?”.

You have to make several choices in your data analysis:

• Are you interested in all strength variables, a single one or an weighted average?
• Are you interested in all time-points or only pre-post/pre-mid?
• Do you want to use a simple comparison of change scores, an ANCOVA or a mixed model?
• Do you test an hypothesis or estimate differences (do you think there is a difference in these two approaches?)

Report your results with at least one figure and if needed tables and of course results in the text. A simple way to structure the report is background, methods (including “Statistical analysis”), results and discussion. I expect that you make a little review of the literature for each study, what are the evidence for increased intensity and volume? Include 2-3 references per study.

Try hard to describe what you do in your statistical analysis in the methods section.

Set all code chunks to echo = FALSE and upload both the report and an Rmd-file with your code.

Tips

• Use the built in reference system in R-markdown to format your references.
• Use the emmeans package to get model estimates (see lesson on mixed models) for figures
• Take some time to format your figures and write figure captions using fig.cap = in each code chunk. This makes the report look nice!