Wilcox paired test error message
Hi, If you're doing exactly as described below, then you need to add the data argument to wilcox.test so R knows where to find beforesmall and aftersmall. But if so, that's a rather uninformative error message. Saraj
On Sun, Jun 23, 2013 at 2:34 PM, ruth parker <parkeractonruth at gmail.com> wrote:
Hi, I've been trying to run a wilcox paired test on some data beforesmall aftersmall [1,] 63.5 512.0 [2,] 54.5 237.5 [3,] 52.5 161.5 [4,] 78.0 153.5 [5,] 53.5 68.0 [6,] 50.5 65.5 [7,] 69.0 52.0 [8,] 76.0 59.0 [9,] 68.0 66.5 [10,] 75.5 66.5 [11,] 67.0 45.5 [12,] 81.0 54.5 [13,] 49.0 44.0 [14,] 51.0 42.5 [15,] 53.0 34.5 using wilcox.test(beforesmall ~ aftersmall,paired=T) but I get the error message: Error in wilcox.test.formula(beforesmall ~ aftersmall, paired = T) : grouping factor must have exactly 2 levels I don't have any missing values, I have the same amount of data points for each group and I've looked everywhere trying to find the answer. Please can somebody tell me how to make it work thanks
Sarah Goslee http://www.functionaldiversity.org