王伟

I build Python tools that turn messy data into decisions — and I test them before I hand them over.

Joined on Oct 21, 2026

王伟

Nov 6

Three Answers to "How Many Coins Should I Test?"

#trading #backtesting #data #python

4 min read

Want to connect with 王伟?

Create an account to connect with 王伟. You can also sign in below to proceed if you already have an account.

Create Account

Already have an account? Sign in

王伟

Oct 31

I Costed Futures Like Crypto, and Half the Loss Was Made Up

#trading #backtesting #futures #python

3 min read

王伟

Oct 30

One Missing Call Site Turned -5.7% Into +17.9%

#trading #backtesting #python #debugging

4 min read

王伟

Oct 29

"Enough Trades" Is Not a Number, It Is a Ratio

#statistics #trading #backtesting #python

4 min read

王伟

Oct 21

After 455 Parameter Sets, a t-Stat of 2.18 Means Nothing

#statistics #trading #backtesting #python

4 min read

王伟

Oct 21

My Walk-Forward Said +29.2 Per Trade. Honest Out-of-Sample Said -4.6.

#trading #backtesting #statistics #python

4 min read

王伟

Oct 21

The One-Line Fix That Took My t-Stat From 6.22 to 1.04

#trading #backtesting #python #quant

7 min read

DEV Community

王伟

Badges

1 Week Community Wellness Streak

Writing Debut

Three Answers to "How Many Coins Should I Test?"

Want to connect with 王伟?

I Costed Futures Like Crypto, and Half the Loss Was Made Up

One Missing Call Site Turned -5.7% Into +17.9%

"Enough Trades" Is Not a Number, It Is a Ratio

After 455 Parameter Sets, a t-Stat of 2.18 Means Nothing

My Walk-Forward Said +29.2 Per Trade. Honest Out-of-Sample Said -4.6.

The One-Line Fix That Took My t-Stat From 6.22 to 1.04