On Apr 1, 2011, at 11:24 AM, Yan Jiao wrote:
boxplot(c(1:3),c(4:6),c(5:8))
df <- structure(list(grp = c(1, 1, 1, 2, 2, 2, 3, 3, 3, 3),
val = c(1L, 2L, 3L, 4L, 5L, 6L, 5L, 6L, 7L, 8L)),
.Names = c("grp", "val"),
row.names = c(NA, -10L),
class = "data.frame")
boxplot(val~grp,data=df)
lm(val~grp, data=df)
#Call:
#lm(formula = val ~ grp, data = df)
#Coefficients:
#(Intercept) grp
# 0.04348 2.21739
?abline
abline(reg=lm(val~grp, data=df) )
--
David Winsemius, MD
West Hartford, CT
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