Dylan Beaudette wrote: > > It's intended so that quant=N gives "N-tiles", e.g. quant=4 gives > > quartiles, quant=10 gives deciles, etc. AIUI, the convention is not to > > include the endpoints, e.g. "quartiles" are given as 25%, 50%, and 75%. > > Is this a convention? I am not a math/stats expert, but in R I see that the > convetion is to report it like this: > > # generate some random data > x <- rnorm(100) > # compute quartiles: > quantile(x) > 0% 25% 50% 75% 100% > -2.1691897 -0.3627331 0.1307290 0.6652009 2.4798260 > > # we can see that it includes the min/max: > summary(x) > Min. 1st Qu. Median Mean 3rd Qu. Max. > -2.16900 -0.36270 0.13070 0.07639 0.66520 2.48000 > > Is this just a display/semantics thing?
I don't have a statistics background, but I'm more familiar with seeing e.g. 1st, 2nd, and 3rd quartiles, without the 0th and 4th quartiles. I can add the 0th and Nth quantiles if desired (i.e. quant=N gives N+1 values). -- Glynn Clements <[email protected]> _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
