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I've collected minute data for forex scarped by yahoo finance for last year Columns: Timestamp,close,high,low,open,volume https://www.dropbox.com/sh/1j4gitwy81oo0k7/AACoPasZR4dVHkMNXxUnZwr6a?dl=0
Although quite simple connected scatterplots can give interesting new insights on how time series perform together: http://steveharoz.com/research/connected_scatterplot/ As an example: Gold vs. S&P 500 from 1970 till today: The green point marks 1970, the red point is today. Every point is a year, moving vertically upwards means rise in the S&P ...
I found a good lis of indices from QUANDL . They have a nice list of indices which you can pull from by ticker/symbol. I am not aware they provide by CUSIP
Volume should never be negative. Period. Volume can be zero (0) on rare occasions. Usually related to an ECN. The most likely cause is during processing, the cumulative volume exceeded the int size of a variable (32-bit) and rolled over. Some programming languages will use -1 (0xFFFFFFFF) to designate an integer overflow.
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