Code and output from R and SPSS for the statistical analyses of "Volitional Processes in Changing Physical Activity: A Randomized Controlled Trial with Individuals with Knee Osteoarthritis".
The final article is available at: Lorbeer, N., Schwarzer, R., Keller, J., Di Maio, S., Domke, A., Armbrecht, G., Börst, H., Martus, P., Ertel, W., Luszczynska, A., & Knoll, N. (2025). Volitional processes in changing physical activity: A randomized controlled trial with individuals with knee osteoarthritis. Health Psychology, 44(6), 597–607. https://doi.org/10.1037/hea0001453