For this case I would use a permutation test. Start by choosing some
statistic that represents your 4 students across the different grades,
some possibilities would be the sum of scores across grades and
students, or mean, or median, or ...
Compute the selected statistic for your 4 students and
Thank you for the replies.
So what my test wants to do is this:
I have a big matrix, 30 rows (students in a class) X 50 columns (students
grades for the year).
An example of the matrix is as such:
grade1 grade2grade3 . grade 50
student 1
student 2***
The chi-squared test is one option (and seems reasonable to me if it
the the proportions/patterns that you want to test). One way to do
the test is to combine your 2 matrices into a 3 dimensional array (the
abind package may help here) and test using the loglin function.
On Thu, Mar 8, 2012 at
Thank you. Can the chi-squared test compare two matrices that are not the
same size, eg if matrix 1 is a 2 X 4 table, and matrix 2 is a 3 X 5 matrix?
On Fri, Mar 9, 2012 at 4:37 PM, Greg Snow 538...@gmail.com wrote:
The chi-squared test is one option (and seems reasonable to me if it
the the
You should probably read up on what the chi-squared test actually
tests: in one form, it asks whether some set of observations could
have come from a given multinomial distribution. Concretely, it asks
whether it is reasonable to get 3 blues, 4 reds, and 2 whites from a
uniform distribution over
-Original Message-
From: r-help-boun...@r-project.org
[mailto:r-help-boun...@r-project.org] On Behalf Of aoife doherty
Thank you. Can the chi-squared test compare two matrices that
are not the same size, eg if matrix 1 is a 2 X 4 table, and
matrix 2 is a 3 X 5 matrix?
No.
Just what null hypothesis are you trying to test or what question are
you trying to answer by comparing 2 matrices of different size?
I think you need to figure out what your real question is before
worrying about which test might work on it.
Trying to get your data to fit a given test rather
Hi.Please help if someone can.
Problem:
I have 2 matrices
Eg
matrix 1:
Freq None Some
Heavy32 5
Never8 13 8
Occas14 4
Regul 95 7
matrix 2:
Freq None Some
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