Blog

Notes on probabilistic thinking and systematic trading.

About the author
Kyo Won Jeong
Researcher, Quantitative Trader

He holds a Ph.D. in Electrical and Computer Engineering from UC San Diego (advisor: Pavel Pevzner) and a B.S. in Electrical Engineering from Seoul National University. He is a bioinformatics (proteomics) researcher in Germany. He works in algorithms, machine learning and statistical modeling, and applies the same methodology to systematic trading.

Thinking in Probabilities 8

The Ant Walking on a Sphere

A trading journal is not optional.

2026-10-12
Thinking in Probabilities 7

Ebb and Flow

I guess you’ve never blown up while “responding flexibly”?

2026-10-06
Thinking in Probabilities 6

The Trading Triangle

Digging into more trading strategies alone won't bring you successful trades...

2026-10-04
Thinking in Probabilities 5

Predictability and the Black Swan

You bought another insurance policy today, though.

2026-09-30
Thinking in Probabilities 4

They say the only free lunch in investing is diversification. What about trading?

But is it really free?

2026-09-28
Thinking in Probabilities 3

A Single Trade vs. 1,000 Trades

The expected value is the same. So what changes?

2026-09-24
Thinking in Probabilities 2

How many trades will I make throughout my lifetime?

Two large numbers: the trades I will repeat, and the market participants that dwarf me. How a single drop of water creates one direction amid the waves.

2026-09-22
Thinking in Probabilities 1

A broken TV and probabilistic thinking

A 0.01% failure rate means something completely different at 500 units versus 100,000. The probability doesn't change; the number of repetitions does.

2026-09-21
Thinking in Probabilities 0

What Is Probabilistic Thinking?

The one thing that matters most in trading. Even what already happened is one of many possible outcomes that was realized, not destiny.

2026-09-21
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