[R] FW: R Statistics

[Chel Hee Lee]

Or, you may use this approach:

 > attach(achtergrond)
 > spits <- ifelse(uurenminuut >= 5.30 & uurenminuut < 9.30, "morning",
+ ifelse(uurenminuut >=16.30 & uurenminuut < 19.0, "evening",
+ "between"))
 > table(spits)
spits
between evening morning
    1636     142     579
 >

I personally like the approach presented by Bill Dunlap (in the previous 
message).  I think his approach is smart and nice.  You will see the 
same results as shown in the above:

 > 
achtergrond$spits=cut(achtergrond$uurenminuut,c(-1.0,5.30,9.30,16.30,19.0,24.0),right=FALSE)
 > levels(achtergrond$spits) <- 
c("between","morning","between","evening","between")
 > table(achtergrond$spits)

between morning evening
    1636     579     142
 >

You can also use function 'findInterval()' instead of using 'cut()'.  I 
hope this helps.

Chel Hee Lee


On 12/02/2014 02:04 PM, William Dunlap wrote:
> You can do this in 2 steps - have cut() make a factor with a different
> level for each time period
> then use levels<-() to merge some of the levels.
>     > z <- cut(.5:3.5, breaks=c(0,1,2,3,4), labels=c("0-1", "1-2", "2-3",
> "3-4"))
>     > levels(z)
>     [1] "0-1" "1-2" "2-3" "3-4"
>     > levels(z) <- c("between", "1-2", "between", "3-4") # or
> levels(z)[c(1,3)] <- "between"
>     > str(z)
>     Factor w/ 3 levels "between","1-2",..: 1 2 1 3
>
>
>
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
> On Tue, Dec 2, 2014 at 11:32 AM, Dries David <dries-david at hotmail.com>
> wrote:
>
>>
>>>> Hey
>>>> I have a question about making a new variable in R. I have put my
>> dataset in attachment. I have to make a new variable "spits" where
>> spits=morning when uurenminuut (also a variabel) is between 5.30 and 9.30,
>> when uurenminuut is between 16.30 and 19.0 spits has to be equal to
>> evening. But here is my problem: for all the values not between 5.30- 9.30
>> and 16.30-19.0 spits must be equal to "between"
>>>>
>>>> achtergrond$minuutdec=achtergrond$minuut/100
>>>> achtergrond$uurenminuut=achtergrond$uur+achtergrond$minuutdec
>>>>
>> achtergrond$spits=cut(uurenminuut,c(-1.0,5.30,9.30,16.30,19.0,24.0),labels=c("between","morning","between","evening","between"),right=FALSE)
>>>>
>>>> When I do this i get a warning message, because I use between more
>> than once as label. Between has to be one label that covers all values that
>> are not in morning and evening.
>>>>
>>>> Could you help me with this?
>>>>
>>>> Kind regards
>>>>
>>>> Dries David
>>>>
>>>
>>
>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> 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.
>>
>>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
>