Dear All,
Is there a better way to include NA's of a factor in the output of table()
than using as.character()?
Admittedly, I do not understand the help page for table concerning the
exclude argument applied to factors. I tried in different ways, but could
not get NA to be included in the table, if not using as.character() (see
example).
Greetings,
Heinz
## example
fcv <- factor(c('a', NA, 'c'))
table(fcv) # shows a, c
table(fcv, exclude='a') # shows c
table(fcv, exclude="") # shows a, c
table(fcv, exclude=NULL) # shows a, c
table(as.character(fcv), exclude=NULL) # shows a, c, NA
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status Patched
major 2
minor 3.1
year 2006
month 07
day 01
svn rev 38471
language R
version.string Version 2.3.1 Patched (2006-07-01 r38471)
fcv <- factor(c('a', NA, 'c'), exclude=NULL)
table(fcv, exclude=NULL)
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Heinz Tuechler a ?crit :> Dear All,
>
> Is there a better way to include NA's of a factor in the output of
table()
> than using as.character()?
> Admittedly, I do not understand the help page for table concerning the
> exclude argument applied to factors. I tried in different ways, but could
> not get NA to be included in the table, if not using as.character() (see
> example).
>
> Greetings,
> Heinz
>
> ## example
> fcv <- factor(c('a', NA, 'c'))
> table(fcv) # shows a, c
> table(fcv, exclude='a') # shows c
> table(fcv, exclude="") # shows a, c
> table(fcv, exclude=NULL) # shows a, c
> table(as.character(fcv), exclude=NULL) # shows a, c, NA
>
> platform i386-pc-mingw32
> arch i386
> os mingw32
> system i386, mingw32
> status Patched
> major 2
> minor 3.1
> year 2006
> month 07
> day 01
> svn rev 38471
> language R
> version.string Version 2.3.1 Patched (2006-07-01 r38471)
>
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