mets (version 1.2)

drelevel: relev levels for data frames

Description

levels shows levels for variables in data frame, relevel relevels a factor in data.frame

Usage

drelevel(data, x, ref = NULL, regex = mets.options()$regex, sep = NULL,
  ...)

Arguments

data

if x is formula or names for data frame then data frame is needed.

x

name of variable, or fomula, or names of variables on data frame.

ref

new reference variable

regex

for regular expressions.

sep

seperator for naming of cut names.

...

Optional additional arguments

Examples

data(mena)
dstr(mena)
dfactor(mena)  <- ~twinnum
dnumeric(mena) <- ~twinnum.f

dstr(mena)

mena2 <- drelevel(mena,"cohort","(1980,1982]")
mena2 <- drelevel(mena,~cohort,"(1980,1982]")
dlevels(mena)
dlevels(mena2)
drelevel(mena,ref="(1975,1977]")  <-  ~cohort
drelevel(mena,ref="(1980,1982]")  <-  ~cohort
dlevels(mena,"coh*")
dtable(mena,"coh*",level=1)

### level 1 of zyg as baseline for new variable
drelevel(mena,ref=1) <- ~zyg
drelevel(mena,ref=c("DZ","[1973,1975]")) <- ~ zyg+cohort
### level 2 of zyg and cohort as baseline for new variables
drelevel(mena,ref=2) <- ~ zyg+cohort
dlevels(mena)