plot_3segAttrition: Return a ggplot2 object displaying the 3 segment attrition...
In FabienNicol/suppliesdash: EFS LFP Sales Dashboard

plot_3segAttrition uses f_basicAttrition. grey dashed lines shows the half-life.

plot_3segAttrition(SuppliesLevel4, attritionProfile, hwmodel2,
  segA_percent = c(0.1, 0.3), segA_begin = 24, segA_end = 48,
  segB_percent = c(0.7, 0.4), segB_begin = 36, segB_end = 120,
  segC_percent = c(0.2, 0.3), segC_begin = 60, segC_end = 240)

`SuppliesLevel4`	a string
`attritionProfile`	astrin TBC
`hwmodel2`	a string TBC
`segA_percent`	a double, the share of the population in segment A.
`segA_begin`	an integer, month where decline starts for segment A.
`segA_end`	an integer, month where decline ends for segment A.
`segB_percent`	a double, the share of the population in segment B.
`segB_begin`	an integer, month where decline starts for segment B.
`segB_end`	an integer, month where decline ends for segment B.
`segC_percent`	a double, the share of the population in segment C.
`segC_begin`	an integer, month where decline starts for segment C.
`segC_end`	an integer, month where decline ends for segment C.