how to calculate correlation between sjo and fdm what is the best correlated time series what is the best correlation for a period of normalized difference? when to use fdm for precipitation which of the following methods can be used to determine the highest correlated time series? which is best to compare rainfall to normalized difference? how to find the most correlated time series how to find the best correlation in r how to find the best correlated time series how to calculate correlations between time series what is the correlation for rainfall what is the best correlation why is r normalised difference better than raw? what are correlated time series how to calculate correlation coefficients in r how does r normalize difference what is normalized average precipitation and normalized difference what is normalized precipitation in r is r normalized difference better how is r correlated to precipitation