r - Use describe function by another variable -


for sample data frame:

df1 <- structure(list(x = structure(1:9, .label = c("a", "b", "c", "d",                                                      "e", "f", "g", "h", "i"), class = "factor"), col.1 = c(2.4, 5.6,                                                                                                             7.4, 3.5, 31.2, 2, 7.9, 5, 17.8), col.2 = structure(c(1l, 1l,                                                                                                                                                                   2l, 2l, 2l, 1l, 2l, 2l, 1l), .label = c("cat", "dog"), class = "factor")), .names = c("x",                                                                                                                                                                                                                                                         "col.1", "col.2"), class = "data.frame", row.names = c(na, -9l                                                                                                                                                                                                                                                        ))

i wish create summary stats col.1 column. whilst use:

library(psych) describe(df1$col.1)

i want instead create summary stats used in describe col.2 (this characters in example factors in real data). example have summary stats cat , dog.

you can conditional analysis tapply:

tapply(df1$col.1, df1$col.2, describe) # $cat #   vars n mean   sd median trimmed  mad min  max range skew kurtosis   se # 1    1 4 6.95 7.41      4    6.95 2.67   2 17.8  15.8 0.65    -1.77 3.71 #  # $dog #   vars n mean    sd median trimmed  mad min  max range skew kurtosis   se # 1    1 5   11 11.43    7.4      11 3.56 3.5 31.2  27.7 1.01       -1 5.11

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