My range of values is pretty tight but I want the cut function to force the intervals, even if it means making the interval range quite narrow. But it is not doing this.
temp <- c(8.32, 8.43, 8.41, 7.86, 7.98, 7.86, 8.07, 8.51, 7.92, 7.94, 8.36)
bins = 3
labels = c("Low","Medium","High")
categories <- cut(temp, breaks=bins, labels=labels)
> categories
[1] High High High Low Low Low Low High Low Low High
Levels: Low Medium High
But if I ask it to cut into 4 intervals, I do get more of a range…
bins = 4
labels = c("Low","Medium","High", "Very High")
categories <- cut(temp, breaks=bins, labels=labels)
> categories
[1] High Very High Very High Low Low Low Medium Very High Low Low Very High
Levels: Low Medium High Very High
How can I get my 3 interval range to include some values as "medium" ???
>Solution :
1) quantile Try cutting on quantiles
cut(temp, breaks = quantile(temp, 0:3 / 3), labels = labels,
include.lowest = TRUE)
## [1] Medium High High Low Medium Low Medium High Low Low
## [11] High
## Levels: Low Medium High
2) quantcut or try quantcut from gtools
library(gtools)
quantcut(temp, q = 3, labels = labels)
## [1] Medium High High Low Medium Low Medium High Low Low
## [11] High
## Levels: Low Medium High