Hi,
I have a longitudinal balanced tendon injury study with two treatment groups of horses (n=6/group) with 5 measurements over 6 mos measured on multiple MRI sequences. I have multiple questions with how I want to analyze this information, but my current question is the most pressing:
Below is an example of the script I ran in RStudio looking at tendon volume on a proton density MRI sequence:
ezANOVA(data=mri,dv=.(Ten.V.PD),wid=.(Horse),within=.(Date),between=.(Treatment,Age),detailed=TRUE)
It gave an output showing an effect of Date and Age: Date. For some parameters it is also showing an effect of Age alone.
Is it possible to do Tukey's multiple comparisons on Age, Date, and Age: Date immediately following the ezANOVA?
I have seen examples online of TukeyHSD using aov fit but not with repeated measures. Also, I am unfamiliar with the aov syntax. If I need to learn about aov and re-run everything in order to do this, I will. However, I would like to avoid that at this time, if possible.
FYI, I am newer than a newbie at R and programming. I am trying frantically to learn enough about R to complete the stats for my thesis ASAP. I could explain more of why I turned to R with such a short time line if anyone wants to hear me whine, but it is off topic and doesn't change the fact that I need to get this done.
Also, I have installed RCommander and feel like I could use that if RStudio is inadequate for the job. I'm not sure I could do this in stock R without serious hand holding and step by step instructions.
I would appreciate any advice you may have. Thanks.
I have a longitudinal balanced tendon injury study with two treatment groups of horses (n=6/group) with 5 measurements over 6 mos measured on multiple MRI sequences. I have multiple questions with how I want to analyze this information, but my current question is the most pressing:
Below is an example of the script I ran in RStudio looking at tendon volume on a proton density MRI sequence:
ezANOVA(data=mri,dv=.(Ten.V.PD),wid=.(Horse),within=.(Date),between=.(Treatment,Age),detailed=TRUE)
It gave an output showing an effect of Date and Age: Date. For some parameters it is also showing an effect of Age alone.
Is it possible to do Tukey's multiple comparisons on Age, Date, and Age: Date immediately following the ezANOVA?
I have seen examples online of TukeyHSD using aov fit but not with repeated measures. Also, I am unfamiliar with the aov syntax. If I need to learn about aov and re-run everything in order to do this, I will. However, I would like to avoid that at this time, if possible.
FYI, I am newer than a newbie at R and programming. I am trying frantically to learn enough about R to complete the stats for my thesis ASAP. I could explain more of why I turned to R with such a short time line if anyone wants to hear me whine, but it is off topic and doesn't change the fact that I need to get this done.
Also, I have installed RCommander and feel like I could use that if RStudio is inadequate for the job. I'm not sure I could do this in stock R without serious hand holding and step by step instructions.
I would appreciate any advice you may have. Thanks.