pctiles: Show the rounded values at 100 percentiles

In ejanalysis/analyze.stuff: Miscellaneous Tools for Analyzing Data in Rows and Columns

Show the rounded values at 100 percentiles

Description

Get a quick look at a distribution by seeing the 100 values that are the percentiles 1-100

Usage

pctiles(x, probs = (1:100)/100, na.rm = TRUE, digits = 3)

Arguments

x	Required numeric vector of values whose distribution you want to look at.
probs	Optional vector of fractions specifying percentiles. (1:100)/100 by default.
na.rm	TRUE by default, specifies if NA values should be removed first.
digits	Number, 3 by default, how many decimal places to round to

Value

Returns a data.frame

NOTE: THIS ONLY SHOWS PERCENTILES AND MEAN FOR THE VALID (NOT NA) VALUES !# Defining these types as type=1 and type="i/n" will create simple discontinuous quantiles, without interpolation where there are jumps in the values analyzed.

This is how should be calculating percentiles as of 2/2013. *** WARNING: Unless set type=1, the default type=7 in which case stats::quantile() FUNCTION INTERPOLATES, WHICH ISN'T OBVIOUS IN EVERY DATASET! use type=1 to avoid interpolation. and pctiles() rounded results so interpolation would be even less apparent.
The quantile function will NOT interpolate between values if type=1:
stats::quantile(1:12, probs=(1:10)/10, type=1)
10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
2 3 4 5 6 8 9 10 11 12
###########################
**** IMPORTANT ***
###########################
*** WARNING: The wtd.quantile function DOES interpolate between values, even if type='i/n'
There does not seem to be a way to fix that for the wtd.quantile() function. For example,
wtd.quantile(1:12, probs=(1:10)/10, type='i/n', weights=rep(1,12))
10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
1.2 2.4 3.6 4.8 6.0 7.2 8.4 9.6 10.8 12.0

See Also

pctiles() pctiles.exact() pctiles.a.over.b() wtd.pctiles.exact() wtd.pctiles() wtd.pctiles.fast()

Examples

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ejanalysis/analyze.stuff documentation built on Dec. 11, 2024, 2:16 p.m.