Five number summaries, fractiles
There is Tukey's five number summary (minimum, lower hinge, median, upper hinge, maximum)
fivenum(urb)
and
summary(urb)
(same information as fivenum but with labels for the five values): in addition
it also accepts matrices and data frames as arguments, e.g. summary(world) displays
the five numbers for all numerical variables in world
In package LearnEDA there is an lval function:
lval(urb)
displaying all letter values for a variable.
Besides these functions, there are of course many functions meant to produce
order statistics.
- median(urb) the median
- IRQ(urb) the interquartile range)
- range(urb) the range
- quantile(urb) function to produce any quantile (fractile);
produces quantiles for a probability of 0,0.25, 0.5, 0.75 et 1). If you wish to produce other specific quantiles
use the probs argument.
- quantile(urb,probs=0.10)
- quantile(urb,probs=c(0.33,0.66,1))
- boxplot.stats(urb) this ancillary function for boxplots can be used as such to
produce the key values needed to display a boxplot. boxplot.stats(urb)$stats returns
five values: the end point of the lower whisker (the lower adjacent value), lower hinge, median, upper hinge and upper
adjacent value. See help(boxplot.stats) for more
details namely the returned values and options.
Remember that you always can use apply() to compute a statistic for a series of variables.
apply(world,2,median)
Computes the median for all variables (columns of world).