I much prefer the factor function over the as.factor function for converting
character to factor, since you can set the levels in the order you want them to
be.
--
Sent from my phone. Please excuse my brevity.
On March 4, 2016 10:07:27 AM PST, Sarah Goslee <sarah.gos...@gmail.com> wrote:
>As everyone has been telling you, as.factor().
>If you like the mutate approach, you can call as.factor(test$subject)
>to convert it.
>
>Here's a one-liner with reproducible data.
>
>
>testdata <- structure(list(subject = structure(1:6, .Label =
>c("001-002",
>"002-003", "003-004", "004-005", "005-006", "006-007"), class =
>"factor"),
> group = structure(c(1L, 1L, 1L, 2L, 2L, 2L), .Label = c("boys",
> "girls"), class = "factor"), wk1 = c(2L, 7L, 9L, 5L, 2L,
> 1L), wk2 = c(3L, 6L, 4L, 7L, 6L, 4L), wk3 = c(4L, 5L, 6L,
> 8L, 3L, 7L), wk4 = c(5L, 4L, 1L, 9L, 8L, 4L)), .Names = c("subject",
>"group", "wk1", "wk2", "wk3", "wk4"), class = "data.frame", row.names =
>c(NA,
>-6L))
>
>testdata$subject <- as.factor(substring(as.character(testdata$subject),
>1, 3))
>
>> testdata
> subject group wk1 wk2 wk3 wk4
>1 001 boys 2 3 4 5
>2 002 boys 7 6 5 4
>3 003 boys 9 4 6 1
>4 004 girls 5 7 8 9
>5 005 girls 2 6 3 8
>6 006 girls 1 4 7 4
>> str(testdata)
>'data.frame': 6 obs. of 6 variables:
> $ subject: Factor w/ 6 levels "001","002","003",..: 1 2 3 4 5 6
> $ group : Factor w/ 2 levels "boys","girls": 1 1 1 2 2 2
> $ wk1 : int 2 7 9 5 2 1
> $ wk2 : int 3 6 4 7 6 4
> $ wk3 : int 4 5 6 8 3 7
> $ wk4 : int 5 4 1 9 8 4
>
>Sarah
>
>On Fri, Mar 4, 2016 at 1:00 PM, KMNanus <kmna...@gmail.com> wrote:
>>
>> Here’s the dataset I’m working with, called test -
>>
>> subject group wk1 wk2 wk3 wk4 place
>> 001-002 boys 2 3 4 5
>> 002-003 boys 7 6 5 4
>> 003-004 boys 9 4 6 1
>> 004-005 girls 5 7 8 9
>> 005-006 girls 2 6 3 8
>> 006-007 girls 1 4 7 4
>>
>>
>> if I call mutate(test, place = substr(subject,1,3), “001 is the first
>observation in the place column
>>
>> But it’s a character and “subject” is a factor. I need place to be a
>factor, too, but I need the observations to be ONLY the first three
>numbers of “subject.”
>>
>> Does that make my request more understandable?
>
>______________________________________________
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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.
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