Re: [R] tapply with specific quantile value

From: Peter Alspach <Peter.Alspach_at_plantandfood.co.nz>
Date: Fri, 25 Mar 2011 13:03:20 +1300

Tena koe Steven

The ... argument of the apply series of functions allows one to pass arguments to the called function. So:

tapply(x, l.c.1, quantile, probs=0.75)

should work (although I haven't tested it).

HTH ..... Peter Alspach

> -----Original Message-----
> From: r-help-bounces_at_r-project.org [mailto:r-help-bounces_at_r-
> project.org] On Behalf Of Steven Ranney
> Sent: Friday, 25 March 2011 12:18 p.m.
> To: r-help_at_r-project.org
> Subject: [R] tapply with specific quantile value
>
> All -
>
> I have an example data frame
>
> x l.c.1
> 43.38812035 085
> 47.55710661 085
> 47.55710661 085
> 51.99211429 085
> 51.99211429 095
> 54.78449958 095
> 54.78449958 095
> 56.70201864 095
> 56.70201864 105
> 59.66361903 105
> 61.69573564 105
> 61.69573564 105
> 63.77469479 115
> 64.83191994 115
> 64.83191994 115
> 66.98222118 115
> 66.98222118 125
> 66.98222118 125
> 66.98222118 125
> 66.98222118 125
>
> and I'd like to get the 3rd quantile by l.c.1 so I use
>
> tapply(x, l.c.1, quantile)
>
> and my output includes all quantiles (i.e., 0, 25%, 50%, 75%, 100%)
> but I'm only interested in the 75% quantile. Is there an additional
> statement or function I can use to get just the quantile that I want?
>
> Thanks for your help -
>
> SR
> Steven H. Ranney
>
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