check_expdist: Check if observed data can be modeled by the exponential...

In gmlang/ezplot: A collection of functions for making common statistical charts in ggplot2

Check if observed data can be modeled by the exponential distribution.

Description

The exponential distribution is the probability distribution of the time between events in a process in which events occur continuously and independently at a constant average rate. Its mean and standard deviation are equal to the inverse of the average rate. check_expdist takes in a data frame and returns a function for making ggplot2 type of CDF and CCDF (on log-y scale) plots side by side on one canvas of any continuous variable from the data frame. CCDF standands for Complement CDF. If CCDF on log-y scale is linear, the observed variable can be modeled by the exponential distribution with a rate equal to the absolute value of the slope.

Usage

check_expdist(df)

Arguments

df	A data frame.

Value

function(varname, linew = 0.7, xlab = varname, title_left, title_right, subtitle_left, subtitle_right, caption_left, caption_right, digits = 2, ...)

• varname. String, name of a continuous variable. Its empirical CDF will be plotted along side its complement CDF.

• linew. Number, width of the line. Default = 0.7.

• xlab. String, x label of the left and the right figures. Default is varname.

• title_left. String, title of the left figure.

• title_right. String, title of the right figure.

• subtitle_left. String, subtitle of the left figure.

• subtitle_right. String, subtitle of the right figure.

• caption_left. String, caption of the left figure.

• caption_right. String, caption of the right figure.

• digits. Integer, the number of digits after the decimal point for the estimated parameter values of the theoretical distribution. Default = 2.

• .... Other parameters for making a CDF plot. A common one, for example, is 'add_vline_median = TRUE', which will add a vertical line at the median. Another common one is 'show_label_median = FALSE', which will suppress the display of median value along the median vline. See mk_cdfplot for a full list of parameters.

See Also

est_params_expdist for how the rate of the theoretical exponential distribution is estimated.

Examples

inst/examples/ex-check_expdist.R

gmlang/ezplot documentation built on Sept. 18, 2022, 6:33 a.m.