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calculate a increase rate & the contribution.
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| grow <- function(x){diff(x)/x[-length(x)]} #a rate of change. | |
| cont <- function(a,all){ #contribution | |
| grow(a) * (a/all)[-length(a)] | |
| } |
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Example
http://abrahamcow.hatenablog.com/entry/2014/09/25/103230