[R] request: a class having max frequency
Chuck Cleland
ccleland at optonline.net
Fri Jun 6 15:28:38 CEST 2008
On 6/6/2008 9:18 AM, Chuck Cleland wrote:
> On 6/6/2008 9:14 AM, Muhammad Azam wrote:
>> Dear R users
>> I have a very basic question. I tried but could not find the
>> required result. using
>> dat <- pima
>> f <- table(dat[,9])
>>
>>> f
>> 0 1 500 268
>> i want to find that class say "0" having maximum frequency i.e 500. I
>> used
>>> which.max(f)
>> which provide 0 1 How can i get only the "0". Thanks and
>
> table(iris$Species)
>
> setosa versicolor virginica
> 50 50 50
>
> which.max(table(iris$Species))
> setosa
> 1
>
> names(which.max(table(iris$Species)))
> [1] "setosa"
If, as above, more than one category frequency is at the maximum, you
might want something like this:
x <- table(iris$Species)
which(x == max(x))
setosa versicolor virginica
1 2 3
names(which(x == max(x)))
[1] "setosa" "versicolor" "virginica"
>> best regards
>>
>> Muhammad Azam Ph.D. Student Department of Medical Statistics,
>> Informatics and Health Economics University of Innsbruck, Austria
>>
>> [[alternative HTML version deleted]]
>>
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--
Chuck Cleland, Ph.D.
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