[R] Can package plyr also calculate the mode?
Peter Ehlers
ehlers at ucalgary.ca
Thu Apr 4 00:56:43 CEST 2013
On 2013-04-03 14:59, Sarah Goslee wrote:
> Of course it can. Use the mode() in the same way you used the mean() function.
>
> You didn't provide a reproducible example, so I can't provided tested
> code, but I would think that you can add
> mode=mode(COUNTS) to the ddply() arguments.
?mode will direct you to the help page for _storage_ mode of an object.
That's not likely what the OP had in mind. It seems that what s/he
wants is the "most frequent value". This is (usually) a pretty useless
piece of information, but there are a number of packages that do
provide it.
To the OP:
Install package sos and then do findFn("mode") to see what's available.
E.g. packages, pracma, asbio, dprep, rattle and many others.
Do note that they handle the multimodal situation differently.
Or, write your own, perhaps using table() and which.max().
Peter Ehlers
>
> all1 <- ddply(all,"ACT_NAME", summarise, mean=mean(COUNTS), sd=sd(COUNTS),
>>>> q25=quantile(COUNTS,.25),median=quantile(COUNTS,.50),
>>>> q75=quantile(COUNTS,.75),
>>>> q90=quantile(COUNTS,.90), q95=quantile(COUNTS,.95),
>>>> q99=quantile(COUNTS,.99) )
>
>
>
> On Wed, Apr 3, 2013 at 5:36 PM, Mossadegh, Ramine N.
> <Ramine.Mossadegh at finra.org> wrote:
>> So you mean it cannot be calculated within plyer?
>>
>> -----Original Message-----
>> From: Sarah Goslee [mailto:sarah.goslee at gmail.com]
>> Sent: Wednesday, April 03, 2013 5:36 PM
>> To: Mossadegh, Ramine N.; r-help
>> Subject: Re: [R] Can package plyr also calculate the mode?
>>
>> If you type
>> ?mode
>> at an R prompt you will be able to read the help for the mode() function.
>>
>> On Wed, Apr 3, 2013 at 5:34 PM, Mossadegh, Ramine N.
>> <Ramine.Mossadegh at finra.org> wrote:
>>> I tried mode=?mode(COUNTS) but that doesn't work.
>>>
>>> -----Original Message-----
>>> From: Sarah Goslee [mailto:sarah.goslee at gmail.com]
>>> Sent: Wednesday, April 03, 2013 5:32 PM
>>> To: Mossadegh, Ramine N.
>>> Cc: r-help
>>> Subject: Re: [R] Can package plyr also calculate the mode?
>>>
>>> Sure, you can add the mode in, following the format by the other summary statistics.
>>>
>>> ?mode
>>>
>>> Sarah
>>>
>>> On Wed, Apr 3, 2013 at 5:25 PM, ramoss <ramine.mossadegh at finra.org> wrote:
>>>> I am trying to replicate the SAS proc univariate in R. I got most of
>>>> the stats I needed for a by grouping in a data frame using:
>>>>
>>>> all1 <- ddply(all,"ACT_NAME", summarise, mean=mean(COUNTS), sd=sd(COUNTS),
>>>> q25=quantile(COUNTS,.25),median=quantile(COUNTS,.50),
>>>> q75=quantile(COUNTS,.75),
>>>> q90=quantile(COUNTS,.90), q95=quantile(COUNTS,.95),
>>>> q99=quantile(COUNTS,.99) )
>>>> So I got the mean, median std dev, quantiles etc.
>>>>
>>>> IS there any way I can add the mode to the mixt. Thanks ahead for any
>>>> suggestions.
>>>>
>>>>
>>>>
>
> --
> Sarah Goslee
> http://www.functionaldiversity.org
>
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