Hey guys! Looking for some statistical advice to anticipate review response.
I have done an intervention with 3 groups, 2 of which are in the intervention and 1 that is control. The 2 intervention groups are completeing sled training to potentially increase sprint performance, but they only differ with training load (heavy vs very heavy). The control group continues with normal practice (another team within the same pro soccer league that does not use systematic acceleration training).
All groups have been divided evenly so that initial sprint performance (mean + CI) is similar, therefore we are using pre sprint performance as a covariate in the ANCOVA. There is only one factor (one time point), therefore One-way.
One of my study questions is whether training with heavy sleds is better than doing nothing concrete (i.e. non systematic acceleration training). Therefore, my question is, would it be statistically appropriate to pool the heavy and very heavy sled groups to answer this question, also considering sample size is only 9 (sled 1) + 9 (sled 2) + 10 (control).
The second study question is whether heavy or very heavy worked better, where a simple independant t-test will suffice.
Opinions?
Thanks for all the help!
Hi Johan, i´ll try to give a brief answer or better an opinion. First you need to get acquainted with your data. Take a look on the raw data, the distributions and descriptive statistics. After that you get an impression of your data. Based on that information you choose your test (parametric or non-parametric). T-Test is a very robust test - yes it seems to be sufficient.
Dear Johan,
considering your design, your primary hypothesis was that the very heavy sled group would show different (most likely better) results on sprint performance (I guess). Thus, you will start with ANOVA with three groups and two time points (pre and post intervention). If you do not detect an effect of training load (interaction effect, group x time), it might be possible to pool your groups and compare to ctrl to answer your second question.
Regards
Boris
- Badges
- Science topic
- Similar topics
- Organizational Psychology
- Training