Levels number of a factor object

6 messages · Laurent Houdusse, Marc Schwartz, tobias.verbeke@bivv.be +3 more

Original

1

6

Laurent Houdusse

Fri, Jan 23, 2004 6:24 AM #

Hi all!

    How to retrieve the levels number of a factor object?
    See this code:
    groups<-gl(4,10)
    I want to retrieve the number of levels (4) of my object "groups"
    I tried groups.levels but this don't work

    Thanks


Laurent Houdusse 
Analyste Programmeur

Fri, Jan 23, 2004 6:33 AM #

On Fri, 2004-01-23 at 08:24, Laurent Houdusse wrote:

Use nlevels() for the number of levels and levels() to get the actual
level values:

[1] 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4 4 4 4
[35] 4 4 4 4 4 4
Levels: 1 2 3 4

[1] 4

[1] "1" "2" "3" "4"

See ?nlevels and ?levels for more information.

HTH,

Marc Schwartz

tobias.verbeke@bivv.be

Fri, Jan 23, 2004 6:42 AM #

r-help-bounces at stat.math.ethz.ch wrote on 23/01/2004 15:24:21:

Is

length(levels(groups))


what you were looking for ?


HTH,

Tobias

Fri, Jan 23, 2004 6:49 AM #

> levels(groups)
[1] "1" "2" "3" "4"
 > length(levels(groups))
[1] 4

      Is this what you want? 
      spencer graves

Laurent Houdusse wrote:

______________________________________________
R-help at stat.math.ethz.ch mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html

Fri, Jan 23, 2004 6:50 AM #

Laurent Houdusse <l.houdusse at cerep.fr> writes:

Do you mean just

length(levels(groups))

?

O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907

Thomas Petzoldt

Fri, Jan 23, 2004 7:05 AM #

Laurent Houdusse schrieb:

Simply try:

length(levels(groups))

Thomas P.