check_weibull: Check if observed data can be modeled by the weibull...

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

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

Description

The weibull distribution is a generalization of the exponential distribution It's often used to study "time-to-failure", where it gives a failure rate proportional to a power of time (see https://en.wikipedia.org/wiki/Weibull_distribution). check_weibull takes in a data frame and returns a function for making a CDF plot and a variant of CCDF plot on a log-log scale side by side on one canvas of any continuous variable from the data frame. CCDF standands for Complement CDF. If the -logCCDF on a log-log scale is a straight line, the observed data follows a weibull distribution with the shape parameter k = slope and the location parameter lambda = e^(-intercept / k).

Usage

check_weibull(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_weibull for how the parameters of the theoretical weibull distribution are estimated.

Examples

inst/examples/ex-check_weibull.R

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