How Jerry Koosman's Range Factor Compares to Similar Players
Jerry Koosman posted a career Range Factor of 1.14, well below the league average of 3.19 — production that significantly underperformed against league baselines. His best Range Factor season came in 1979, posting 1.62, well below the league average of 3.27 that year. The lowest point came in 1967 at .556, well below the league average of 3.3 that year. Output was consistent through the final seasons. The figure moved from .838 in 1983 to 1.19 in 1984 and .947 in 1985. The consistent output characterized his final seasons. Some season-to-season variance runs through the career line, but the career average remained well below league norms across 19 seasons.
Jerry Koosman Lifetime Range Factor
Stats similar to Range Factor for Jerry Koosman
| Jerry Koosman
Range Factor |
|---|
| Career | 1.141 |
| Season Avg. | 1.141 |
| 162 Game Avg. | 1.141 |
| More Info | See More |
Jerry Koosman Range Factor Per Season
Jerry Koosman's Range Factor for each season of his MLB career, plotted against that year's league average. Switch between comparisons — National League, Hall of Fame, SP, North America, or players born in the same country — to see how he stacked up year by year.
Jerry Koosman Range Factor by Team
Jerry Koosman's career Range Factor totals broken down by each team he played for, ordered by when he first joined that team.
Jerry Koosman Range Factor Year-Over-Year Change
A waterfall chart tracking how Jerry Koosman's career Range Factor shifted from season to season. Each bar represents the change added to his career total that year, making peak and decline phases easy to spot.
Jerry Koosman Range Factor Distribution vs. Comparable Players
Each box summarizes Jerry Koosman's seasonal Range Factor alongside a selected comparison group across all seasons he played. The box covers the middle 50% of seasons, the center line is the median, and the whiskers extend to the min and max. A tighter box means more consistency; a higher median means more output. Use the selector to switch comparison groups.
Jerry Koosman Range Factor — Season-by-Season Breakdown
Every season of Jerry Koosman's MLB career with Range Factor alongside league, Hall of Fame, positional, birth region, and country-of-birth averages for that year. Career totals include sum, average, min, max, and median.
Note: A dash (—) means no qualifying players existed in that comparison group for that season. Most commonly this happens for the Hall of Fame group.
