what is the interval between time series data? when do period have to be equal what is the proper interval to have data on should intervals be equal which of the following is the proper spacing between the time periods in time series data why intervals between time series do you need annual time intervals time period of data when do the time periods of time series have to be equal when to use time series data when do intervals need to have equal spacing when should the time period be equal can you use interval to time periods what is the data format for a data period? how long does it take to get a period of time when do we have to have the same time period in time series which period of time is considered annual time period of equal intervals when does a time period need to be equal in intervals when are time periods equal