plot_magic_carpet: plot_magic_carpet

In gloverd2/codeBase: Contains standard functions for Admiral Advance Analytics

Description

This plot visually compares how predictions change over a factor. The ratio of two predictions proposed_pred/incumbent_pred is calculated for each row. Two plots are produced which display For each level of the feature we find what is the proportion of row with each ratio For each value of the ratio what is the proportion of row with each value of the feature The log2 is used to calculate the ratio as this is symmetrical the values of log2(proposed_pred/incumbent_pred) which are plotted are -ratio_max, -(n * ratio_step), -((n-1) * ratio_step), ..., -ratio_step, 0, ratio_step, ..., (n-1) * ratio_step, n * ratio_step, ratio_max

Usage

plot_magic_carpet(
  feature,
  feature_name,
  incumbent_pred,
  proposed_pred,
  weight = rep(1, length(feature)),
  n_bins = 10,
  ratio_max = 1,
  ratio_step = 0.05,
  position = "fill"
)

Arguments

feature	array[numeric/character/factor] - value of feature
feature_name	character - name of feature
incumbent_pred	array[numeric] - values of incumbent prediction
proposed_pred	array[numeric] - values of proposed prediction
weight	array[numeric] - weight of each row
n_bins	intergerish - number of buckets to split each (numeric) feature into
ratio_max	numeric - max ratio at which to cap the incumbent_pred/proposed_pred ratio
ratio_step	numeric - step size to divide ratio bins.
position	character - either "fill" or "stack". If "fill" all bars are the same hight and extra line is added to show relative population. If "stack" bar hight gives population.

Examples

n=100
feature1 <- seq(-10, 10, length.out=n)
feature2 <- rep(c("a", "b", "c"), each=ceiling(n/3))[1:n]
incumbent_pred <- 100 + rnorm(n)
proposed_pred <- 100 + rnorm(n) + seq(-10, 10, length.out=n)

plot_magic_carpet(feature=feature1, feature_name="example feature",
                  incumbent_pred = incumbent_pred,
                  proposed_pred = proposed_pred)

plot_magic_carpet(feature=feature2, feature_name="example feature",
                  incumbent_pred = incumbent_pred,
                  proposed_pred = proposed_pred)

gloverd2/codeBase documentation built on Dec. 20, 2021, 11:48 a.m.