[R] tapply with specific quantile value

[Tóth Dénes]

Just have a look at ?quantile and the probs argument.

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

Anyway, quantiles and quartiles are not the same. I guess you meant the
3rd quartile.


> 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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