| summ_spread {pdqr} | R Documentation |
Summarize distribution with spread
Description
Functions to compute spread (variability, dispersion) of distribution (i.e.
"how wide it is spread"). summ_spread() is a wrapper for respective
summ_*() functions (from this page) with default arguments.
Usage
summ_spread(f, method = "sd")
summ_sd(f)
summ_var(f)
summ_iqr(f)
summ_mad(f)
summ_range(f)
Arguments
f |
A pdqr-function representing distribution. |
method |
Method of spread computation. Should be one of "sd", "var", "iqr", "mad", "range". |
Details
summ_sd() computes distribution's standard deviation.
summ_var() computes distribution's variance.
summ_iqr() computes distribution's interquartile range. Essentially, it is
a as_q(f)(0.75) - as_q(f)(0.25).
summ_mad() computes distribution's median absolute deviation around the
distribution's median.
summ_range() computes range length (difference between maximum and minimum)
of "x" values within region of positive probability. Note that this might
differ from length of support because the latter might be
affected by tails with zero probability (see Examples).
Value
All functions return a single number representing a spread of distribution.
See Also
summ_center() for computing distribution's center, summ_moment()
for general moments.
Other summary functions:
summ_center(),
summ_classmetric(),
summ_distance(),
summ_entropy(),
summ_hdr(),
summ_interval(),
summ_moment(),
summ_order(),
summ_prob_true(),
summ_pval(),
summ_quantile(),
summ_roc(),
summ_separation()
Examples
# Type "continuous"
d_norm <- as_d(dnorm)
## The same as `summ_spread(d_norm, method = "sd")`
summ_sd(d_norm)
summ_var(d_norm)
summ_iqr(d_norm)
summ_mad(d_norm)
summ_range(d_norm)
# Type "discrete"
d_pois <- as_d(dpois, lambda = 10)
summ_sd(d_pois)
summ_var(d_pois)
summ_iqr(d_pois)
summ_mad(d_pois)
summ_range(d_pois)
# Difference of `summ_range(f)` and `diff(meta_support(f))`
zero_tails <- new_d(data.frame(x = 1:5, y = c(0, 0, 1, 0, 0)), "continuous")
## This returns difference between 5 and 1
diff(meta_support(zero_tails))
## This returns difference between 2 and 4 as there are zero-probability
## tails
summ_range(zero_tails)