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qoelet/annual_maxima.R

Last active January 4, 2016 21:49
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annual_maxima.R
# calculating annual maxima from a time series (df)
df$year <- floor_date(df$date, "year")
df_maxima <- ddply(df, "year", summarise, orders=max(orders))
head(arrange(df_maxima, desc(orders), 3) # top 3
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