why is it difficult to run tbats tbats function why do tbats have negative tbats what is the difference between a series tbats what is tbats function tbats r what to use what r function requires positive data when tbats is negative, what is the result when can tbats be used on r why is tbats a variable in r why does tbats demand positive numbers can you use tbats on a stationary series what r function does tbats use? do you have to make a negative series in tbats what is tbats? what is the tbats formula used for what makes tbats function fail why does tbats need negative data what program will use a positive series to calculate the value of a positive series what makes tbats