First, they explain that if a given variable is playing a role in affecting well-being, then we should expect any change in that variable to correlate with the observed changes in well-being.
First, they explain that if a given variable is playing a role in affecting wellbeing then we should expect any change in that variable to correlate with the observed changes in wellbeing.
And then the combined prediction model of the Observed data is formed, which consider the correlation of the variable with the other variable and self-dependency of the variable itself fully.