Glossary

Value Hits

(VH%)
BIP H 1B 2B 3B HR AVG OBP SLG BABIP BACON wOBA
20607 17985 1242 7104 668 8971 .879 .874 2.606 .777 .874 1.424

You will see this stat thrown around quite liberally when talking about xStats, this is a unique measure which aims to count the number of extremely high quality pieces of contact produced by a batter or surrendered by a pitcher. As you can see in the stats above, Value Hits are the highest quality batted balls in the game. They register as extra base hits 81% of the time, and account for 85% of all home runs, 43% of doubles, and 37% of triples. On the main stats sheets you will see the stat expressed as VH%, which measures Value Hits per Plate Appearance.


Poor Hits

(PH%)
BIP H 1B 2B 3B HR AVG OBP SLG BABIP BACON wOBA
68085 1201 1019 122 16 44 .018 .018 .022 .017 .018 .017

This is the opposite of Value Hits, and aims to measure the absolute worst contact in baseball. Poorly Hit balls are near automatic outs, with an on base percentage of .018. Even on the rare occasions when these balls become hits, they are kept to singles 85% of the time. On the main stats sheets you will see the stat expressed as PH%, which measures Poor Hits per Plate Appearance.


Ideally Hit

BIP H 1B 2B 3B HR AVG OBP SLG BABIP BACON wOBA
16345 11123 134 2370 475 8144 .690 .681 2.414 .363 .358 1.251

While not as commonly cited as Value Hits, Ideally Hit Balls- also referred to as Ideal Hits, or Ideal Contact- will be referenced occasionally. These batted balls have a vertical angle between 21 and 36 degrees and an exit velocity of at least 96 mph. This stat is not tracked on the primary stats sheet, but there is a separate link to an Ideally Hit Balls Sheet which contains many different stats you may find useful.


Well Struck

BIP H 1B 2B 3B HR AVG OBP SLG BABIP BACON wOBA
35736 13814 617 3827 700 8670 .398 .386 1.301 .190 .510 .625

This is the little brother of Ideally Hit.  Where Ideally Hit Measures batted balls with an exit velocity of at least 96 mph, Well Struck measures those with at least 80 mph. Otherwise, they both measure balls with a vertical launch angle between 21 and 36 degrees.  This stat is occasionally referenced, but isn't explicitly tracked on any sheet or source.


scFIP

scFIP = 13 × x H R + 3 × B B - 2 × K I P + C

Statcast Fielding Independent Pitching, scFIP, uses the expected home run rate generated by xStats to estimate a pitcher's ERA assuming league average results on his batted balls, taking into account launch angle and exit velocity. Launch angle and exit velocity can predict with reasonable certainty whether a ball will go over a wall, but other factors, such as wind and air density, can sometimes play a significant role in the final outcome. scFIP gives a pitcher credit for his ability to control quality of contact, but grants him the assumption of average results on that contact. Over time, if the same type of contact is surrendered, you'd expect the home run rate, and thus his FIP, to approach his scFIP.


Dribble Balls

(DB%)
BIP H 1B 2B 3B HR AVG OBP SLG BABIP BACON wOBA
138986 26910 24854 1956 100 0 .194 .194 .209 .194 .194 .176

Dribble balls have a vertical launch angle below 0 degrees. They can have any horizontal angle or exit velocity. This stat may be represented as a fraction of total Plate Appearances (DB%).


Ground Balls

(GB%)
BIP H 1B 2B 3B HR AVG OBP SLG BABIP BACON wOBA
49802 23686 21478 2108 100 0 .476 .476 .522 .476 .476 .436

Ground Balls have a vertical launch angle between 0 and 10 degrees. They can have any horizontal angle or exit velocity. This stat may be represented as a fraction of total Plate Appearances (GB%).


Low Drive

(LD%)
BIP H 1B 2B 3B HR AVG OBP SLG BABIP BACON wOBA
66738 46718 31958 12982 1278 500 .707 .701 .964 .698 .700 .710

Low Drives have a vertical launch angle between 10 and 19 degrees. They can have any horizontal angle or exit velocity. This stat may be represented as a fraction of total Plate Appearances (LD%).


High Drive

(HD%)
BIP H 1B 2B 3B HR AVG OBP SLG BABIP BACON wOBA
47846 25296 7800 9034 1030 7432 .540 .529 1.252 .442 .529 .730

High Drives have a vertical launch angle between 19 and 26 degrees. They can have any horizontal angle or exit velocity. This stat may be represented as a fraction of total Plate Appearances (LD%).


Fly Ball

(FB%)
BIP H 1B 2B 3B HR AVG OBP SLG BABIP BACON wOBA
66886 20262 4322 3026 768 12146 .313 .303 .947 .148 .303 .502

Fly Balls have a vertical launch angle between 26 and 39 degrees. They can have any horizontal angle or exit velocity. This stat may be represented as a fraction of total Plate Appearances (FB%).


Pop Up

(PU%)
BIP H 1B 2B 3B HR AVG OBP SLG BABIP BACON wOBA
55186 2386 1164 588 54 580 .044 .043 .089 .033 .043 .055

Pop Ups have a vertical launch angle above 39 degrees. They can have any horizontal angle or exit velocity. This stat may be represented as a fraction of total Plate Appearances (PU%).