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Guys, there different methods of calculating Put Call Ratio (#PCR).
There are two types of PCR – 1. PCR OI 2. PCR Volumes.

PCR OI = Total Put OI / Total Call OI

Few traders prefers to calculate PCR for particular expiry, while few calculate it using combined data.

(1/n)
In combined data, one take all expiry and all strikes to calculate PCR. This can be easily done in excel from Bhavcopy data.

Many software/apps/websites provides PCR OI (all expiry) and some gives us an option to select particular expiry as well.

(2/n)
Now, when we calculate PCR-OI on monthly expiry day, we exclude the series which expired and calculate using data of coming expiries only. Some software do calculate in the same way.

(3/n)
But when it comes to calculating PCR-OI on weekly expiry, they doesn’t exclude OI of the weekly series which already expired. I’ve been noticing it from many weeks that PCR is incorrect (that’s my view) in most of the paid softwares on Thursdays.

(4/n)
Infact I told one of the paid software to change the calculation few months back, but they didn’t change that yet (I won’t name it here).

The data, which is already expired, shall not be taken into consideration for PCR. That’s my view and it may differ with others.

(5/n)
For today’s PCR calculation, I simply excluded the data of 9 July expiry and calculated it. My Nifty PCR is 1.67.

I got the same reply from @AshishZBiz, @Niteshca7
and @vishal_o82

It would be great if others can share their calculation as well.

(n/n)
if you include today's data as well (which already expired), then PCR comes to 1.60

Now, you only think whats the use of the data which expired 🤔🧐
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