How Billy O'Brien's ERA Compares to Similar Players
Billy O'Brien posted a career ERA of 1.8, well below the league average of 3.83 — a mark that ranked among the best of his era. Across 1 season, the ERA arc showed a promising start, with limited data making longer-term conclusions premature. With 1 season of data, the ERA arc was above league norms — too limited for reliable trend analysis. Some season-to-season variance runs through the career line, but the career average remained well above league norms across 1 season.
Billy O'Brien Lifetime ERA and Similar Stats
Stats similar to ERA for Billy O'Brien
| Billy O'Brien
ERA | Billy O'Brien
Component ERA | Billy O'Brien
Defense Independent ERA |
|---|
| Career | 1.8 | 1.94 | 2.5 |
| Season Avg. | 1.8 | 1.94 | 2.5 |
| 162 Game Avg. | 1.8 | 1.94 | 2.5 |
| More Info | See More | See More | See More |
Billy O'Brien ERA Per Season
Billy O'Brien's ERA for each season of his MLB career, plotted against that year's league average. Switch between comparisons — National League, Hall of Fame, 1B, North America, or players born in the same country — to see how he stacked up year by year.
Billy O'Brien ERA by Team
Billy O'Brien's career ERA totals broken down by each team he played for, ordered by when he first joined that team.
Billy O'Brien ERA Year-Over-Year Change
A waterfall chart tracking how Billy O'Brien's career ERA 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.
Billy O'Brien ERA Distribution vs. Comparable Players
Each box summarizes Billy O'Brien's seasonal ERA 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.
Billy O'Brien ERA — Season-by-Season Breakdown
Every season of Billy O'Brien's MLB career with ERA 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.
