Yahoo Finance historical trading volume data on six market indexes are identical. How can that be?
I use trading volume data as an integral part of my technical analysis, and write and lecture extensively about it. At first I was thrilled to see that Yahoo Finance is offering daily trading volume data on the S&P 500 index (^GSPC) all the way back to 1950. I'm writing a book which includes analysis of very long term trends in the market, and I would dearly love to trust and use the volume data you're reporting. But I was dismayed to find that those volume data are exactly the same as you're reporting for five other market indexes - ^NYA, ^DJA, ^DJI, ^DJT and ^OEX. Of course, those six cannot possibly be trading exactly the same volume each day since there are different stocks in each of the six.
How do you generate the volume numbers you report for these six? What do they really represent?
error in data feeding
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