On Aug 25, 2009, at 6:25 AM, Inchallah Yarab wrote:
Thank you very much Peter it works!!
the second step is to calculate the sum of variable in each class!!!
how can i do this!!!
?table
?xtab
________________________________
De : Petr PIKAL <petr.pi...@precheza.cz>
Cc : r-help@r-project.org
Envoyé le : Mardi, 25 Août 2009, 11h53mn 21s
Objet : Odp: [R] Re : Odp: Re : table function
Hi
r-help-boun...@r-project.org napsal dne 25.08.2009 11:28:31:
Â
Thank you Peter,
in my vector Z i have missing value ""NA" and i want to count its
number
in the vector
i had did alla this i know the difference between a numeirc and a
factor
OK. If you know difference between factor and numeric you probably
have
seen
?factor
where is note about how to make NA an extra level
#Here is z
z<-c(10,100, 1000, 1200, 2000, 2200, 3000, 3200, 5000, 6000)
#let's put some NA values into it
z[c(2,5)] <-NA
#let's make a cut
z.c<-cut(z, breaks = c(-Inf, 1000, 3000, Inf), labels = c("0 - 1000",
">1000 - 3000", ">3000"))
#as you see there are NA values but they are not extra level
z.c
[1] 0 - 1000 <NA> 0 - 1000 >1000 - 3000 <NA>
[6] >1000 - 3000 >1000 - 3000 >3000 >3000 >3000
Levels: 0 - 1000 >1000 - 3000 >3000
is.na(z.c)
[1] FALSE TRUE FALSE FALSE TRUE FALSE FALSE FALSE FALSE FALSE
# so let's try what help page says
factor(z.c, exclude=NULL)
[1] 0 - 1000 <NA> 0 - 1000 >1000 - 3000 <NA>
[6] >1000 - 3000 >1000 - 3000 >3000 >3000 >3000
Levels: 0 - 1000 >1000 - 3000 >3000 <NA>
# wow we have NA as extra level, let's do table
table(factor(z.c, exclude=NULL))
0 - 1000 >1000 - 3000 >3000 <NA>
2 3 3 2
Regards
Petr
the goal of this exercice that to count the number of missing value,
number
betwwen 0-1000 , 1000-3000, >3000.
Thank you again for your help
________________________________
De : Petr PIKAL <petr.pi...@precheza.cz>
Cc : r-help@r-project.org
Envoyé le : Mardi, 25 Août 2009, 11h15mn 23s
Objet : Odp: [R] Re : table function
Hi
r-help-boun...@r-project.org napsal dne 25.08.2009 10:08:36:
Hi Mark,
Thank you for your answer !! it works but if i have "NA" in the
vector
z
what
i shoud do to count its number in Z?
You do not have NA in z, you manage to convert it somehow to factor.
Please try to read about data types and its behaviour. Start with
this
chapter
2.8 Other types of objects
in R intro manual which I suppose you have in doc folder of R program
directory. You possibly can convert it back to numeric by
e.g.
DF$z <- as.numeric(as.character(DF$z))
but I presume you need to check your original data maybe by
str(your.data) what mode they are and why they are factor if you
expect
them numeric.
Regards
Petr
x   y    z
1Â Â 0Â Â Â 100
5Â Â 1Â Â Â 1500
6Â Â 1Â Â Â NA
2Â Â 2Â Â Â 500
1Â Â 1Â Â Â NA
5Â Â 2Â Â 2000
8Â Â 5Â Â 4500
i did the same but it gives me this error message:
 [0 - 1000] [1000 - 3000]    >3000
      0      0   Â
  0
Warning message:
In inherits(x, "factor") : NAs introduced by coercion
Thank you
________________________________
De : Marc Schwartz <marc_schwa...@me.com>
Cc : r-help@r-project.org
Envoyé le : Lundi, 24 Aoűt 2009, 18h33mn 52s
Objet : Re: [R] table function
On Aug 24, 2009, at 10:59 AM, Inchallah Yarab wrote:
hi,
i want to use the function table to build a table not of frequence
(number
of time the vareable is repeated in a list or a data frame!!) but in
function of classes
[[elided Yahoo spam]]
example
x   y    z
1Â Â 0Â Â Â 100
5Â Â 1Â Â Â 1500
6Â Â 1Â Â Â 1200
2Â Â 2Â Â Â 500
1Â Â 1Â Â Â 3500
5Â Â 2Â Â 2000
8Â Â 5Â Â 4500
i want to do a table summerizing the number of variable where z is
in
[0-1000],],[1000-3000], [> 3000]
thank you very much for your help
See ?cut, which bins a continuous variable.
DF
 x y  z
1 1 0Â 100
2 5 1 1500
3 6 1 1200
4 2 2Â 500
5 1 1 3500
6 5 2 2000
7 8 5 4500
table(cut(DF$z, breaks = c(-Inf, 1000, 3000, Inf),
      labels = c("0 - 1000", ">1000 - 3000",
">3000")))
  0 - 1000 >1000 - 3000    >3000
     2      3    Â
 2
HTH,
Marc Schwartz
  [[alternative HTML version deleted]]
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[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
