Rolling Window Regression (For Beginners)

The purpose of this file is to provide beginners a way to understand and analyse time varying coefficient values within regression analysis particularly with financial data analysis.
The file is easily customisable to suit requirements and contains information describing the code for ease.
I am new to Matlab myself and it should be noted that it is most certainly possible to make the file more efficient and I am currently working on doing so. Hence comments from more advanced users will be highly appreciated.

Thanks
Karan