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    Mixed ANOVA in SPSS - Output interpretation

    I'll try that... although my only experience with propensity score matching was using diff command in Stata. Do you know where can I find how to do matching in a general linear model with repeated measurements? Thank you! Obviously I found differences (p=0.010) but, as you stated, they are...
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    Mixed ANOVA in SPSS - Output interpretation

    Thanks for your kind explanation, Karabiner The study is retrospective (not randomized) and I guess that they used robotic in the patients that could benefit the most from the system (meaning, the ones that had worst alignment). It would. That was the purpose of the analysis. I thought that...
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    Mixed ANOVA in SPSS - Output interpretation

    Hello everyone A knee prosthesis is well positioned when the line that goes from the center of the hip to the center of the ankle passes through the middle of the knee (more or less). We have three methods of knee alignment (conventional, navigation or robotic surgery). And we measured the...
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    Three groups comparison - Repeated measurements

    Hello everyone A knee prosthesis is well positioned when the line that goes from the center of the hip to the center of the ankle passes through the middle of the knee (more or less). We have three methods of knee alignment (conventional, navigation or robotic surgery). And we measured the...
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    Diff command

    I found the solution, so I answer myself in case someone would find it helpful. It is not true that I get different p-values. In my series there was a couple of missing values in one of the variables, so -apparently- Stata is not using some observation to perform the DID. Thus, the group that I...
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    Diff command

    Hello everyone, I have been reading information about the diff command in the following article: https://journals.sagepub.com/doi/pdf/10.1177/1536867X1601600108 And practicing with some data of my own... but I have a doubt and I wonder if anyone could help me to solve it. There I go: When I...
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    Searching for variables that could cause a certain effect

    Thank you for your kind answers but... are you sure that using the post-pre data as the dependent variable will not give you different results compared with using a repeated measurements method? Or difference-in-differences?
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    Searching for variables that could cause a certain effect

    We have measured the range of movement of a hip joint (measured in degrees) before and after surgery. And we have plenty of variables that could explain the differences in the results. Some of them are factors (sex, type of prosthesis, bearing surfaces...) and some are continous (age, weight...
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    Comparing 3 treatments (bimodal results)

    fed2, thank you for your help. But as I said, I am a noob and I need some further explanation. As far as I know, McNemar compares two groups of paired observations... but here we have three groups. And what is the rationale in calculating the difference between #improves and #get worse and to...
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    Comparing 3 treatments (bimodal results)

    Hi everyone I am new here and nearly a complete noob in statistics and my purpose is to learn as much as possible… so I will need a lot of help, so thanks in advance for your consideration. Here I go with my first question: I have 3 different treatments (A, B, C). They are applied to...