how to compare weekly sales how to compare six weeks of sales how to find out what is past week sales what to use for a statistical correlation with sales week how to compare current week to six week mean how to find out what is the mean for a week in r how do you compare the six week mean to the current weeks mean in r how to find the difference between the lowest and highest quantile in r calculate the lower and higher quantile of a company's sales how to compare sales week to week in r how to find historical data in r how to compare sales by week in r how to find out the difference between a week ago and this week in a year? what is the r used for comparing sales data between weeks? how do i compare past week sales and current week sales how to use historical stats to measure sales how to compare current sales week when is an anomaly detected in r what is t test used for in r how to compare 6 week total sales