I wish this included a red, blue, and green iHub volume indicator discussion. Each day iHub is now tracking red vs blue in the daily volume bars for most tickers.
Yesterday it went haywire on many stocks I watch and showed mainly green for most tickers.
The Ameritrade site has a similar chart indicating volume. However, the colors represent whether the share price of last trade in the current period was higher or lower the last trade of the previous period. That seems more helpful than just the direction of last trade of the current period.