Yes, to some degree. Hammers are usually formed when there is a spike of panic volume that causes then down thrust that is short term exhausting the sellers and should lead to a short squeeze (bounce) before going whichever way its going to go.
If you get a hammer and it doesn't reverse it is indicative of someone wanting to get out and they either have a) volume, ie lots of shares to sell or b) no time, meaning that for whatever reason they are in a hurry to dump what they are holding.
I would say a confirmation of this would be a close below the low of the previous hammer, you could try backtesting it with say:
Stock is below some MA (50,200, 20 whatever timeframe you want to see)
hammer formed
close below hammer short with a stop above that day
I find that there is good follow thru on failed hammers and stars since the ppl who got it wrong have to right their position.
The best types are when you get a hammer than a gap down, ie all the hammer buyers are now sellers, these gaps tend not to fill (actually I trade these usually the other way, meaning a shooting star then a gap up)