time series - R Moving Average based on Product (Or Start over new moving average values when I see new Prododuct) -


i tried find answer before post question not lucky. have big dataset 100s of products. compute 'moving averages' based on product. using below code ma not re-setting while moving 1 product other product.

is possible compute ma based on product? please help

library(ttr) df <- data.frame(product=c('milk','milk','milk','milk','milk','milk','milk','milk',                            'eggs','eggs','eggs','eggs','eggs','eggs','eggs','eggs'),                   sales=c(404,410,500,520,480,400,590,500,                         400,499,520,500,444,400,570,580                        )); df$sma2 <- sma(df[,"sales"],3)


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