as.afactor {RelativeRisk} | R Documentation |
Changes columns of a data frame into factors
as.afactor(cName,data,levOrder,curLevs)
cName |
The quoted column name to change |
data |
A data frame, or matrix. |
levOrder |
The desired ordering of the levels. |
curLevs |
The current levels in the same order as in levOrder |
Makes the column with name cName
into a factor.
if levOrder
is present, these will be the levels of the factor. When curLevs
is missing,the values in levOrder
must be
the complete set of unique values in the cName
columnn.
If curLevs
is present, the levOrder
values will be mapped into them in the cName
column; that is,
if curLevs=1:3
, and levOrder=c("a","c","b")
then any value 2 in the cName
column will be replaced
by "c".
A data frame with changes in the column cName
.
Bob Wheeler bwheelerg@gmail.com
Please cite this program as follows:
Wheeler, R.E. (2009). as.afactor RelativeRisk. The R project for statistical computing http://www.r-project.org/