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The new intraday periods. and Larry Williams
The new intraday periods that StockCharts.com added recently attempt to divide up the trading day into somewhat equal periods. The new periods are
Some of the periods appear to only produce chart data for 6 months max. Others don't have those limitations. So, if you want to look at a 1 year chart using the 195 min period, you can. If you want the 1 year in 130 min, the data is truncated to start at March 1 at the moment. About 6 months. I don't know if this time frame will "grow" from March 1 going forward or if it will stay at 6 months. Just something to be aware of.
Side note: Tom Bowley, on his site, did an interesting webinar the other day talking about interesting performance differences, he had calculated, in the trading perfomance in 1st 2 hours, the middle, and the last 2 hours of the trading day. Basically breaking the day into 3 bars. Larry Williams also did a recent segment on another site talking about something similar.
Side note 2: It appears that Larry Williams' shows have been removed from StockCharts.com TV. His ACP indicators plug in is still available on ACP. Shows appear to be gone. I liked his shows.