Say I have a series of
N observations, and for each observation, I have 4 variables: $x$, $y$, $z$, and $q$, where $q$'s value depends on at least two of the other variables.
How can I establish the extent to which each of these variables contributes to the value of $q$?
The observations take the form $x_n$, $y_n$, $z_n$, $q_n$, where $x_n$ is the $n$th value of $x$. I'm looking for the overall contribution of $x$, $y$ and $z$ based on the whole series.