Forecasting using multiple regression I have data in the form given below, and I want to perform forecasting using multiple regression. I found definition of multiple regression from this link: < . I have these questions: **(1)** Can we forecast value of Y (the dependent variable) based on the given values of the independent variables (X1 and X2), as in below table? or it is mandatory to have previous values of Y along with X1 and X2 to forecast the future value of Y, **(2)** I want to forecast the value of Y at T8, by providing two inputs, i.e., value of Y_at_T8 = forecast(X1=22, X2=33), how to proceed on that? , **(3)** Is it mandatory for multiple regression that Time must be in fixed intervals, can it increase in varying intervals? !enter image description here

(1) To construct the regression equation you must know the correspending values of y because of the nature of the problem. Otherwise you can't construct the regression equation.

(2) Without knowing y values you can't continue.

(3) The only restriction is that the errors have mean zero and uncorrelated with eachother. You can take any interval you want.