RESEARCH: First half ERA/xERA variances

We take certain fanalytic pitching concepts as rote: strikeouts good, walks bad, and ERA/xERA variances will correct. All three of these are usually true. But how much can you rely on ERA/xERA variance in making roster decisions? And how quickly can we expect the variances to reverse?

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  For more information about the terms used in this article, see our Glossary Primer.