create a subset for "brook_dis". When I plot (week, R) I get a nice boxplot, but along the x axis, there are weeks a, b, c along with h and nh. Thank you ahead of time. keith rm(list=ls()) cond.exp1<-read.csv("condition/test.csv",header=TRUE) sub<-subset(cond.exp1, Species=="brook_dis") attach(sub) plot(week, R) detach(sub) Id Species week 7 bow a 10 bow a 12 bow a 19 bow a 23 bow a 24 bow a 25 bow a 26 bow a 27 bow a 28 bow a 32 bow a 39 bow a 7 bow b 10 bow b 12 bow b 19 bow b 23 bow b 24 bow b 25 bow b 26 bow b 27 bow b 28 bow b 32 bow b 39 bow b 7 bow c 10 bow c 12 bow c 19 bow c 23 bow c 24 bow c 25 bow c 26 bow c 27 bow c 28 bow c 32 bow c 39 bow c 84 brook_dis h 85 brook_dis h 86 brook_dis h 87 brook_dis h 88 brook_dis h 89 brook_dis h 90 brook_dis h 91 brook_dis nh 92 brook_dis nh 93 brook_dis nh 94 brook_dis nh 95 brook_dis nh 96 brook_dis nh 97 -- Keith Cox, Ph.D. Sitka Sound Science Center Fisheries Biologist P.O. Box 464 Sitka, Alaska, 99835 907 752-0563 marlinkcox@gmail.com [[alternative HTML version deleted]]