Two, three, and four or more bets are used to describe raising, re-raising, re-re-raising (raising the re-raiser), and beyond. Five-bets and more are counted along with four-bets, and the total is called "four-plus bets", and are indicated by "4+bets" in FlopZoom's statistics pane. 4+bets are fairly rare.

In limit hold'em, 3-betting means exactly that. You raise to 3 units of the current betting amount. But in no-limit hold'em, 3-betting means re-raising by at least the minimum amount. This can add up exponentially, and if you're not deep stacked, you could end up all-in by 3- or 4-betting.

Note: in the current raise frequency calculation method, FlopZoom shows you the percentage of hands out of the total hand count where each player raised on the flop, turn, and river. This will change with FlopZoom 1.5 to indicate the percentage of flops, turns, and rivers seen where each player 2-bet, 3-bet, and 4+bet.
 

Four street bars plus an average bar
There are four vertical per-street bars for each player for 2-bets, 3-bets, and 4+bets. These represent, from left to right, a player's preflop, flop, turn, and river raising numbers. Each group of bars for each player has a horizontal "any street" bar showing the sum of raises over the four streets. The "any street" total value is displayed in a caption within the horizontal bar, with the exact value indicated by a line drawn underneath the caption.
 

How often did they raise?
Here is an example of how to use the betting statistics to quickly determine who played the most aggressively on the various streets. You can also find out why they raised if their hole cards are known, just by clicking on one of the bars and clicking back to the playback pane.

We've chosen four players and 2-, 3-, and 4+bets. There will usually be more 2-betting than 3-betting and more 3-betting than 4-betting in any session, and this one is no exception. Clicking on the green 2-bet preflop bar of New Player 1 (in green) we see that she 2-bet (raised) on the flop in 3 out of her 14 hands.


Note: this data is from an actual session, but the names have been changed to hide the players' identities. All of the screencaps used in our examples are from actual sessions.  

Why did they raise?
If the player's hole cards are known, you can use the instant playback feature to find out what they were raising with and why. For example, let's see why test_player_0 4+bet the river by clicking on his 4+bet river bar.


We see that he only 4+bet the river on one hand. But why did he get into a raising war with that hand? We can click back to the playback pane to see that hand, since the instant playback feature has loaded the hand into playback.


Aha. It's a classic scenario: aces cracked by a flopped set with an uncoordinated board. test_player_0 thought he must be up against KX, but New Player 1 correctly though he had the best hand. We've advanced to the showdown, but there was quite a bit of raising and re-raising on the river.

If we go back to the statistics pane and click on New Player 1's river 4+bet bar, instant playback brings us back to this same hand. The two players ended up in a raising war on the river and New Player 1 doubled up.
 

Position and opponent count
Just as in the VPP tutorial, you can filter your results for any number of opponents, or full table, short handed, or heads-up. And you can also show PRP for any position or filter for an exact position or a position range.
 

Instant playback
Click on any 2-bet, 3-bet, or 4+bet bar and the hands on which the player raised that street will be loaded into the playback pane's hand list. This is a standard feature across all statistics except AF.
 

Summary
Raising is imperative in successful play, and it can indicate how well or poorly your opponents play. You can use the 2-bet, 3-bet, and 4+bet statistics to see how aggressively your opponents play in comparison to each other. And you can find out why they bet that way on specific hands by simply clicking their per-street bars. The instant playback feature automatically loads the hands in which they made those raises on that street.