Using a column entry as a "selector" for datasets in R -

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my array looks this:

     slide index                   b              c            dosegroup 482    778     l        0            0              2       13gy_p_75_42wk 483    778     r        0            0              2       13gy_p_75_42wk 484    779     l        0            0              2       13gy_p_75_42wk 485    779     r        0            0              2       13gy_p_75_42wk 486   4700     l        2            2              2  14.25gy_c_50pl_42wk 487   4700     r        0            0              1  14.25gy_c_50pl_42wk  488   4701     l        0            0              1  14.25gy_c_50pl_42wk

i use dosegroup column's entries able select respective entries in other columns. able tell r, e.g., "do wilcox.test between 13gy_p_75_42wk , 14.25gy_c_50pl_42wk datasets using column c."

how can r? there kind of way select columns having entry 14.25gy_c_50pl_42wk?

i modified data add third level in dosegroup make more realistic.

txt <- "slide index                   b              c            dosegroup   778     l        0            0              2       13gy_p_75_42wk   778     r        0            0              2       13gy_p_75_42wk   779     l        0            0              2       13gy_p_75_42wk   779     r        0            0              2       13gy_p_75_42wk  4700     l        2            2              2  14.25gy_c_50pl_42wk  4700     r        0            0              1  14.25gy_c_50pl_42wk  4701     l        0            0              1  14.25gy_c_50pl_42wk  4702     l        0            0              10  15gy_c_50pl_42wk"  dat <- read.table(text = txt, header = true)  wilcox.test(c ~ dosegroup, data = dat,        subset = dosegroup %in% c("13gy_p_75_42wk", "14.25gy_c_50pl_42wk"))  ##  wilcoxon rank sum test continuity correction  ## data:  c dosegroup ## w = 10, p-value = 0.1175 ## alternative hypothesis: true location shift not equal 0

to select data, can use 1 of these 2 command.

dat[dat$dosegroup == "14.25gy_c_50pl_42wk", ] subset(dat, dosegroup == "14.25gy_c_50pl_42wk")

those commands basics in r , if read introduction r, you'll able same.

so urge so, want enjoy r.


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