Usually doji star creates a reversal signal & usually it's quite accurate, can be said as 80% of accuracy.
But, sometimes doji star can give you a false signal, mostly gives you good signal.
There's 3 types of doji:
-Long legged doji
Traded very low goes to high & ends at the open at which the leg is longer than its head, the longer the leg the more accurate the signal
-Dragonfly doji
Traded Low & close at the open price which is today's high
-Graveyard doji
Traded high & close at today's low & open. It's called as graveyard as the day's hero has died / beaten because of the dropped price
You can see the graph below.
