Hi Guys,
I have got a couple of questions regarding time series questions.
Q1. As shown in the attachment 'time series', when the data is shown with the actual years(i.e 2004, 2005, etc..) not 1, 2, 3, then on CAS, we should put the x-axis values as the actual years as well right and when you form a regression line for the data, you should sub the actual year into the equation, not 1,2,3 right?
How can you actually tell when you have to use 1,2,3 as the years or the actual years?
Q2. Also, with the other attachment 'predicting', don’t we have to seasonalize the data afterwards? Or does that depend on the information given. Or will the answer of Q7 be such that that will be the seasonalized value? How can you tell when the answer you get from the regression line is the deseasonalized data or seasonalized data?
The actual questions are shown in the attachment of this post
All replies will be very much appreciated. Thanks