[R] npmc and data.frame problems

From: Barbra C. Utley <barb_at_vt.edu>
Date: Wed, 14 May 2008 12:30:05 -0400


I am trying to run a nonparametric comparison of multiple datasets (A-E).

After importing my csv file I sorted the variable value by the letter class (representing height along a streambank).






Next I tested normality and variance assumptions and the data was not normal and the variances were not equal. So I ran a kruskal wallis test.

kruskal.test(Z~Y) came by with p<<0.05 for the group means not being equal.  

Next I loaded the npmc library


The npmc command calls for a dataset. I think my problem lies in the following commands and how they interact with the npmc command. I also tried just one response variable and a class variable like described in the help file but received errors.  



Error in as.vector(x, mode) : invalid argument 'mode'

> mode(dataset)

[1] "list"  

I tried running the debug function on npmc; however, I am not much of a programmer and the code did not make much sense to me.

I would appreciate any help you can give. The professor I normally contact with questions is not available. Thanks,


Barbra C. Utley

Doctoral Candidate

Biological Systems Engineering

Virginia Tech



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