A couple of important, but often over-looked statistics in most poker calculators are the “went to showdown percentage” and the “went to showdown winning percentage”. They may in fact be overlooked even though they are quite important as contributing to the over-all profile of your opponents combined with VPIP and PFR indicators.
Being somewhat overshadowed as indicators useable on their own, the WSD and WSD% are actually relatively accurate clues to two very key factors when gauging your opponents. Knowing your opponent’s propensity to call bets like an “elephant” and knowing his likeliness of calling your bluffs are two pieces of information that can be very costly if you don’t have a handle on them.
“Went to showdown” is determined by comparing the total amount of hands a player has seen all the way to the end of the deal. By the very nature of this action, you know his VPIP has be higher, but if both are high, say like VPIP of 46% and WSD 32% you have virtually no chance of taking this player off a pot. You can label this player an "elephant" style player who pretty much always calls while thinking you don't really have anything. They typify wishful thinking to dangerous and costly levels.
The “went to showdown win percentage” helps qualify an opponent’s play in the “went to showdown” indicator because if he is actually winning the showdowns he could be getting a good run of cards, playing great position, and even making some fantastic reads. The reality is, this confirms your opponent's lack of skill in understanding thier hole cards and readin the community cards. The lower this percentage is, also indicates a player’s overall experience where something around the 40% range or lower means you are dealing with someone who may simple not know the difference in rank between a straight and a flush.
You must be able to make sense of these indicators and incorporate that into extra cautious strategies against weak player. When presented with inflated numbers in these categories the only strategy against these guys is decisive value betting. That may mean betting strong hands only, while favoring to check medium strength hands until the river. If you have't figured this out yet…. they are un-bluffable! This is reason enough to hang on to your stack by saving your chipos for better spots.