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I have some data:

x <- c(0.0636931012704989, 0.0421033586843369, 0.0214721845269228, 
0.038624779052474, 0.033235347720021, 0.0307709640052774, 0.0606316442337883, 
0.0289958997354256, 0.0573689255248752, 0.044448618126441, 0.0164384406368751, 
0.0357802024114138, 0.0133831663454831, 0.0329126088838874, 0.051468481535772, 
0.0302927520748979, 0.169023097551101, 0.0311182034472608, 0.117954563949638, 
0.0593735124639249, 0.0110273691186214, 0.0286868155187407, 0.0522496344459376, 
0.0298854332250777, 0.0626024185545931, 0.106914814257457, 0.0396392209572767, 
0.0111988702332617, 0.0276848766950444, 0.0142151606082234)

I would like to find the values, in R preferably, in order to split x equally numbered groups.

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1 Answer 1

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4
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Use the quantiles:

ngroups <- 3
q <- quantile(x, 0:ngroups/ngroups)
sprintf("The boundaries of the %d groups are: %s", groups, paste(signif(q, 3), collapse=", "))
# Or simply:
q

You can then cut:

cut.x <- cut(x, breaks=q, include.lowest=TRUE)
table(cut.x)
# Or split if you want to keep the exact numeric values:
split(x, cut.x)
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2
  • $\begingroup$ Thank you. Perfect. Just how do I access the values? I tried table(cut.x)[1][1], etc, but cannot find a value directly. $\endgroup$
    – Timothée HENRY
    Jan 30, 2014 at 16:22
  • 1
    $\begingroup$ The cut points are in q. I added some information to show them. Also if you want to keep the numeric data you can use split. There are thousands of ways to use this. $\endgroup$
    – Calimo
    Jan 30, 2014 at 16:59

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