You know that feeling when something goes incredibly right — like, suspiciously right — and then the very next time it falls completely apart? And you start wondering if you jinxed yourself, or if the universe has some kind of cosmic balancing act it's running behind your back?

Yeah. It's not the universe. It's regression to the mean, and it is one of those concepts that sounds like a math class you slept through but is actually quietly running your entire life.

I stumbled onto this idea and could not stop thinking about it. So here we go.

Wait, what actually is regression to the mean?

Regression to the mean is what happens when an unusually high or low result is followed by something closer to normal. It's not a correction. It's not punishment. It's just probability doing its thing.

The term was coined by Francis Galton in the 1800s when he noticed that very tall parents tended to have children who were tall — but not as tall. And short parents had kids who were short — but not quite as short. Over generations, heights drifted toward average. Not because something was pulling them there, but because extreme outcomes are, by definition, rare.

Why does this keep catching us off guard?

Human brains are terrible at distinguishing between "this happened because of something I did" and "this happened because randomness has a shape." We want causation. We need a story.

So when a athlete has the game of their life and then plays terribly the next week, we blame overconfidence, or the pressure, or the coach's bad call. We don't think: oh, that first game was just a statistical outlier pulling itself back toward average. But that's often exactly what happened — and researchers have written about this exact bias at length.

It doesn't mean the second game wasn't bad. It means the first game was probably unrealistically good.

Is this the same as the “Sports Illustrated curse”?

Pretty much. The Sports Illustrated cover curse — where athletes supposedly decline after being featured — is probably just regression to the mean wearing a spooky costume.

You don't end up on the cover of Sports Illustrated after a mediocre season. You get there after your absolute peak. And statistically? After your peak, you average out. Nothing cursed about it. Just numbers being numbers.

That said, I don't want to be completely cold about this. There IS something real about the pressure that comes with a huge spotlight. That part isn't nothing. But it's not a curse. It's a math problem with a side of anxiety.

Does regression to the mean show up in everyday life?

Constantly. In ways that are kind of uncomfortable once you notice them.

Got unusually great feedback on a project at work and then got middling reviews next time? Regression. Had a weirdly perfect travel day — no delays, no lines, found a great seat — and then the next trip was a chaotic nightmare? Also regression. You weren't cursed. You weren't being punished for bragging. You were just coming back down from a statistical high.

Even parenting runs into this. A kid has a great testing week and you go all in on praise. The next week is terrible and you think you did something wrong. You didn't. The good week was probably partly luck.

Okay but does this mean nothing we do actually matters?

No — and this is where I think a lot of people misread the concept.

Regression to the mean doesn't mean effort is pointless. It means you can't use one extraordinary result — in either direction — as your true baseline. Your real baseline is the average across a lot of tries. The good news is that practice genuinely shifts that average over time. So effort matters enormously. It just doesn't show up in every single performance.

The trap is treating your best day as your new normal and being devastated when tomorrow isn't that. That's not failure. That's just how distributions work.

So how do you actually use this information?

Honestly? The most useful thing regression to the mean teaches you is to wait before overreacting.

Before you fire the coach after one bad game, wait. Before you declare yourself a genius investor after one good quarter, wait. Before you decide a new diet is magic because you had a great week, wait and see if it holds. One data point — especially an extreme one — is almost never the whole story.

The Thinking, Fast and Slow crowd has been saying this for years. Daniel Kahneman literally built a career on pointing out that humans are wired to build narratives around data points that don't deserve them.

Does knowing about this actually change anything?

A little. It won't stop you from feeling gutted when a great streak ends. But it might stop you from making a dramatic decision based on one outlier in either direction.

And maybe — just maybe — it takes some pressure off. Your worst day isn't who you are. Your best day isn't who you are either. The average of all of them? That's the number that actually means something.

Regression to the mean is one of those things that sounds like it's trying to make you feel average, but it's actually kind of freeing. You don't have to explain every high and every low with a story. Sometimes the numbers just do what numbers do.

But what do I know? I'm just out here trying not to jinx myself every time something goes really, really well.