put/call ratio

#1
Hi, I am having few doubts wrt put/call ratio, can anyone guide me :

1) What is the difference between put/call ratio-vol & Put/call ratio-OI? Which is more relevant.

2) Where can i find a chart for put/call ratio Vs Nifty?(link or charts)

3) Which one should i consider only PCR(nifty) or PCR(Nifty+Equities)? If so, what is the relevance?
 
#3
thanks. Few of my doubts still remain open.

where can i find history or chart of put/call ratio against nifty. As just looking at PCR ratio is irrelevant without knowing previous data of PCR.
 

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