[R] tapply with specific quantile value

[Peter Alspach]

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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> and provide commented, minimal, self-contained, reproducible code.

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