ARI
10-18-2011, 10:12 AM
I really hope someone can help as I am a bit lost and my knowdledge in statistics is very basic.
I have done an experiment in which I have measured the energy required to chew three different food samples on 10 subjects with 3 repetitions per sample. I am interested therefore in finding out whether there is a difference between samples according to the energy consumed.
I have performed a Friedman test by ranks followed by multiple comparison procedure (Tukey's honestly significat difference for ranks)
However someone told me that for using that test I should make sure that the error for order effect was not significant. which I don't fully understand.
I provided my samples in the same order for all subjects. That is A,B,C -A1 B1 C1 and A3 B3 C3 for each subject
Can someone tell me 1) whether the test I used (Friedman) is the correct for my purpose 2) Whether the sequence in which I gave the samples affects my result from Friedman test. 3) and if what I have done is incorrect can someone the suggest me a way to analyse my data.
Many tanks in advance firstly for taking the time to read my post and secondly for your help. Really appreciated
I have done an experiment in which I have measured the energy required to chew three different food samples on 10 subjects with 3 repetitions per sample. I am interested therefore in finding out whether there is a difference between samples according to the energy consumed.
I have performed a Friedman test by ranks followed by multiple comparison procedure (Tukey's honestly significat difference for ranks)
However someone told me that for using that test I should make sure that the error for order effect was not significant. which I don't fully understand.
I provided my samples in the same order for all subjects. That is A,B,C -A1 B1 C1 and A3 B3 C3 for each subject
Can someone tell me 1) whether the test I used (Friedman) is the correct for my purpose 2) Whether the sequence in which I gave the samples affects my result from Friedman test. 3) and if what I have done is incorrect can someone the suggest me a way to analyse my data.
Many tanks in advance firstly for taking the time to read my post and secondly for your help. Really appreciated