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A helper function to switch from "new" t values to original t values. This allows for periods not being exactly spaced apart by 1.
t2orig(t, original_time.periods)
original time period converted from new time period
a vector of time periods to convert back to original time periods.
vector containing all original time periods.
original_time.periods <- c(2001, 2003, 2005, 2007) t2orig(1:4, original_time.periods) ## returns c(2001, 2003, 2005, 2007)
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