[isatrader]

I have a question with regard to relative strength. If I use a spread/ratio chart (index is "NIFTY") will that be sufficient? or do I have to use Mansfield RS(it's available in tradingview, no idea about its calculation)?

If you want to compare against the NIFTY then that is fine. To convert the standard ratio chart to a Mansfield RS, all you need to do is add a 52 week MA to the spread chart, as that is the "Zero Line" on the flattened Mansfield RS chart. On the daily chart a rough equivalent is the 252 day MA.