If you are using the NSE data then there is something wrong because I also used the data from NSE site and your and mine data doesn't match.
I used this historical data for trading last 3 years
Add future and ATM put price and check again
please check below link:
http://nseindia.com/products/content/derivatives/equities/historical_fo.htm
I used this historical data for trading last 3 years
Add future and ATM put price and check again
please check below link:
http://nseindia.com/products/content/derivatives/equities/historical_fo.htm
I am posting feb series and may series data screen shot from NSE website.According to this I am right.If I am calculating somewhere wrong correct me.