Out of context qs. How much back fill data one need to have for accurate technical analysis? Most prof data vendors gives data from 1994 for nse, I just experimented with back fill data since 2001 n compare it with backfill data since 1994( all eod), there is immense difference in indicator values. On same basis most low cost data providers gives intraday data of last 5 days, n considering amibroker saves data n so u hv nw intra data of 1-2 years still there wd be minute diff in indicator value.
Now I wonder wt do traders in American markets do? How much backfill data is enough for trading professionally ? is there set standard ? parameter? like 10 years ,5 years? As American market is very old n its impossible 2 save data in one trading sw