Looking at a chart and saying "I'd have bought down at this support and sold the blow-off top" works just as well.
============== 50 days average of data can be helpful & will make some comments on eod [end of day]systems; you can figure out how it applies to your time frame. More data , the better [eod -years], that way you get plenty of ; uptrends, downtrends, sideways slop /chop trends. For everything there is a time, a season. Elite spell checker system works well, except; over rule it on nicknames, it simply lacks that data. Something else Frost -engine, interesting nickname; frost- season, that is fall-winter-early spring; tends to trend better for underlying stocks.