Hello and help needed!

Hi everybody,
I feel prestige to be able to join the forum and share trading view with all of you...:clap:

I'm looking for way to code a n-day beta of stock indicator in metastock.
Will be much obliged if anybody can give me some suggestion.
I will be using the formula:

beta of stock=covariance(index, stock)/variance(index); where
index and stock are price array which hold the previous n-days price data.

thanks a lot..

hollow_man