subset data frame based on percentage
i have a data frame that contains a data like this :
V1 V2 V3
1 2 0.34
1 3 0.31
1 4 0.12
1 5 0.12
the data frame is bigger but that's an example.
i want to take a subset of this data frame that has the lowest 20% of V3.
how this can be done 开发者_JS百科?
thanks for help
The subset()
function is handy because (among other benefits) it allows you to avoid having to repeatedly mention the name of the data-frame:
subset(dataFrame, V3 <= quantile(V3, 0.2))
ss <- subset(dataFrame, subset=(dataFrame$V3 <= quantile(dataFrame$V3, 0.20)))
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