Stock Performance vs Indices

#1
Greetings,

I would like to understand the method used for charting a stock performance against an index, say the Sensex. For eg, in the bseindia website, if a stock is compared against the Sensex, the y-axis values are in %. Another site, moneycontrol.com appears to use a different method as the y-axis values are in Rs.

So, what is the correct way and if I wanted to do the same in Metastock or Amibroker, how can I go about doing it?

Any guidance would be greatly appreciated.
Asha
 

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