mikeroswell/ratioScales: Rational Scales for Visualizing Change

Logarithmic rescaling makes multiplicative relationships additive, and enables clear visual communication of proprtional change. However, the two ways that logarithmic rescaling has traditionally been displayed on graphs can lead to confusion. These two ways are 1) rescaling the data logarithmically, and marking axes with the log-transformed values, and 2) rescaling the data logarithmically, but marking the axes with the back-transformed values matching the original scale of the data. **ratioScales** provides **ggplot2**- friendly alternatives that highlight multiplicate change explicitly. Three families of tickmark are provided: `divMult` explicitly marks axes with the multiplicative change relative to a reference point (e.g. \eqn{\times 2, \div 2}); `nel` and `centiNel` mark axes with the multiplicative change in units of natural logarithms ("nels"); `propDiff` and `percDiff` mark axes with the proportional difference from the reference point. General functions `scale_y_ratio()` and `scale_x_ratio()` can be added to a ggplot object to use the ratio-scaled axes.

install.packages("remotes")
remotes::install_github("mikeroswell/ratioScales")