The order of an ARIMA model is usually denoted by the notation ARIMA(p,d,q), where Thus, when an autoregressive operator and a mean term are both included in the model, the constant term for the model ...

Integration is the inverse process to differentiation. Some people call it anti-differentiation. Instead of multiplying the power at the front and subtracting one from the power, we add one to the ...

Save guides, add subjects and pick up where you left off with your BBC account. Quadratic expressions can be written in the form \(ax^2 + bx + c\), where \(a\), \(b\) and \(c\) are numbers.