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. 2020 Aug 25;143:104262. doi: 10.1016/j.ijmedinf.2020.104262
sum _ change ⟵ 0
forpast _ day _ number = 1 … Ndo
 change ⟵ L[day − past _ day _ number]
 sum _ change ⟵ sum _ change + change
end for
average _ change ⟵ sum _ change/N
actual _ change ⟵ L[day]
change _ factor ⟵ actual _ change/average _ change