R package ggpmisc. Extensions to ’ggplot2’ respecting the grammar of graphics paradigm. Provides new statistics to locate and tag peaks and valleys in 2D plots, a statistics to add a label with the equation of a polynomial fitted with lm(), or R^2 or adjusted R^2 or information criteria for any model fitted with function lm(). Additional statistics give access to functions in package ’broom’. Provides a function for flexibly converting time series to data frames suitable for plotting with ggplot(). In addition provides two statistics and two geometries useful for diagnosing what data are passed to compute_group() and compute_panel() functions and to geometries.