**Table of Contents**hide

## Introduction to Baseball Statistics

Baseball statistics or sabermetrics is an analytical approach to evaluating baseball players and teams. It is a form of analytics and relies on mathematical formulas to analyze a player’s performance and compare it to other players. Baseball statistics are used to quantify a player’s performance in certain areas such as batting, pitching, and fielding. The goal is to measure the player’s performance and compare it to the performance of other players.

## What are Baseball Statistics?

Baseball statistics are numerical expressions that quantify a player’s performance. The most common baseball statistics are batting average, on-base percentage, slugging percentage, earned run average, and fielding percentage.

### Batting Average

Batting average is a statistic that measures the number of hits a player gets divided by the number of at-bats. The formula for calculating a player’s batting average is hits divided by at-bats. For example, if a player has 30 hits in 100 at-bats, his batting average is .300.

### On-Base Percentage

On-base percentage is a statistic that measures how often a player gets on base. The formula for calculating a player’s on-base percentage is hits plus walks plus hit by pitch divided by at-bats plus walks plus hit by pitch plus sacrifice flies. For example, if a player has 30 hits, 10 walks, and 1 hit by pitch in 100 at-bats, his on-base percentage is .400.

### Slugging Percentage

Slugging percentage is a statistic that measures the number of total bases a player gets divided by the number of at-bats. The formula for calculating a player’s slugging percentage is total bases divided by at-bats. For example, if a player has 30 hits, 10 doubles, and 1 home run in 100 at-bats, his slugging percentage is .500.

### Earned Run Average

Earned run average is a statistic that measures the number of earned runs a pitcher allows divided by the number of innings pitched. The formula for calculating a pitcher’s earned run average is earned runs allowed divided by innings pitched. For example, if a pitcher allows 15 earned runs in 40 innings pitched, his earned run average is 3.75.

### Fielding Percentage

Fielding percentage is a statistic that measures the number of successful plays a fielder makes divided by the number of chances. The formula for calculating a fielder’s fielding percentage is putouts plus assists divided by total chances. For example, if a fielder has 50 putouts and 25 assists in 75 total chances, his fielding percentage is .800.

## Advanced Baseball Statistics

In addition to the traditional baseball statistics, there are a number of advanced statistics that can be used to measure a player’s performance. These statistics measure a player’s performance in areas such as on-base plus slugging, weighted on-base average, wins above replacement, and value over replacement player.

### On-Base Plus Slugging

On-base plus slugging (OPS) is a statistic that measures a player’s ability to get on base and hit for power. The formula for calculating a player’s OPS is on-base percentage plus slugging percentage. For example, if a player has a .400 on-base percentage and .500 slugging percentage, his OPS is .900.

### Weighted On-Base Average

Weighted on-base average (wOBA) is a statistic that measures a player’s ability to get on base and hit for power. The formula for calculating a player’s wOBA is on-base percentage plus slugging percentage plus isolated power. For example, if a player has a .400 on-base percentage, .500 slugging percentage, and .200 isolated power, his wOBA is .900.

### Wins Above Replacement

Wins above replacement (WAR) is a statistic that measures a player’s overall value to a team. The formula for calculating a player’s WAR is wins above replacement divided by games played. For example, if a player has 10 wins above replacement in 100 games played, his WAR is 1.0.

### Value Over Replacement Player

Value over replacement player (VORP) is a statistic that measures a player’s overall value to a team relative to a “replacement player.” The formula for calculating a player’s VORP is wins above replacement divided by plate appearances. For example, if a player has 10 wins above replacement in 400 plate appearances, his VORP is 2.5.

## Conclusion

Baseball statistics are numerical expressions that quantify a player’s performance. There are a number of traditional baseball statistics such as batting average, on-base percentage, and slugging percentage. In addition, there are a number of advanced statistics such as on-base plus slugging, weighted on-base average, wins above replacement, and value over replacement player. All of these statistics are used to measure a player’s performance and compare it to other players.