how many months in seasonal plot if seasonal how long does it take for acf to adjust what should i use to compare the seasonality of a period with calendar data how to add calendar based seasonality when to add seasonal or calendar why do i add a month's difference does the calendar affect seasonality can i find out if a plot is seasonal? how to find if my dates are seasonal when to adjust seasonal data for acf plot can you subtract seasonal and calendar changes how to tell if your data is seasonal how to find out whether a month is seasonal how do i tell if my data is seasonal? how to figure out if period is seasonal do acf plots need seasonal adjustments what is the difference in a calendar plot is acf data seasonal do i have to use the calendar to find seasonality in calendar when you add seasonal variance to a subseries plot