Hi,

i have a dataset and want to run wilcox.test on it but i am getting error

Error in wilcox.test.formula(organ8w$epiWAT ~ as.integer(group), data =
organ8w) :
  grouping factor must have exactly 2 levels

my code is,
head(organ8w)
Group    Liver    Spleen        LV         RV Gastrocnemicus     Soleus
rpWAT   epiWAT       BAT
1  Control 4.483974 0.2147436 0.3387821 0.06282051      1.0160256
0.06025641 0.8878205 3.304487 0.3717949
2  Control 4.593583 0.2754011 0.3438503 0.07219251      0.9812834
0.05882353 0.9224599 2.989305 0.4973262
3  Control 4.318792 0.2483221 0.3291946 0.06375839      0.9798658
0.05939597 0.7080537 2.667785 0.4530201
4  Control 4.400000 0.2933333 0.3490000 0.06766667      1.0700000
0.06300000 0.3766667 1.516667 0.2166667
5  Control 4.206406 0.2348754 0.3384342 0.07153025      0.9893238
0.06120996 0.7793594 2.754448 0.3843416
6  Control 4.323944 0.2887324 0.3802817 0.06373239      0.9577465
0.06161972 0.3591549 1.626761 0.2816901

organ8w$Group
 [1] "Control" "Control" "Control" "Control" "Control" "Control" "Control"
"Control" "Control" "HFD-ED"  "HFD-ED"  "HFD-ED"  "HFD-ED"  "HFD-ED"
 "HFD-ED"  "HFD-ED"  "HFD-ED"
[18] "HFD-ED"  "HFD-ED"  "HFD-ED"  "HFD-ED"  "HFD-M"   "HFD-M"   "HFD-M"
"HFD-M"   "HFD-M"   "HFD-M"   "HFD-M"   "HFD-M"   "HFD-M"   "HFD-M"
"HFD-M"   "HFD-M"

group <- factor(organ8w$Group)
group
 [1] Control Control Control Control Control Control Control Control
Control HFD-ED  HFD-ED  HFD-ED  HFD-ED  HFD-ED  HFD-ED  HFD-ED  HFD-ED
 HFD-ED  HFD-ED  HFD-ED  HFD-ED
[22] HFD-M   HFD-M   HFD-M   HFD-M   HFD-M   HFD-M   HFD-M   HFD-M   HFD-M
  HFD-M   HFD-M   HFD-M
Levels: Control HFD-ED HFD-M

Mann-wit <- wilcox.test(organ8w$epiWAT~ as.integer(group), data= organ8w)
Error in wilcox.test.formula(organ8w$epiWAT ~ as.integer(group), data =
organ8w) :
  grouping factor must have exactly 2 levels

Can someone help me with what is wrong in my code?

Also i have tried to run the same code by omitting NA – na.omit(organ8w)
but getting the same results.

sessionInfo()
R version 3.1.0 (2014-04-10)
Platform: x86_64-apple-darwin13.1.0 (64-bit)

locale:
[1] sv_SE.UTF-8/sv_SE.UTF-8/sv_SE.UTF-8/C/sv_SE.UTF-8/sv_SE.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] gplots_2.13.0   plyr_1.8.1      ggplot2_1.0.0   XLConnect_0.2-7

loaded via a namespace (and not attached):
 [1] bitops_1.0-6       caTools_1.17       colorspace_1.2-4   digest_0.6.4
      gdata_2.13.3       grid_3.1.0         gtable_0.1.2       gtools_3.4.1
      KernSmooth_2.23-12
[10] labeling_0.2       MASS_7.3-33        munsell_0.4.2      proto_0.3-10
      Rcpp_0.11.2        reshape2_1.4       rJava_0.9-6        scales_0.2.4
      stringr_0.6.2
[19] tools_3.1.0

Best regards,
Nikul
Chalmers Univ. Technology
Sweden
-- 
सर्वेsत्र  सुखिन:  सन्तु  सर्वे  सन्तु  निरामया: |
सर्वे भद्राणि पश्यन्तु मा कश्चित दु:ख माप्नुयात ||

	[[alternative HTML version deleted]]

