Guides & How-tos · Worked examples · Real numbers

Personality guides

Step-by-step how-tos, head-to-head comparisons and honest roundups — every guide worked through with current figures, then backed by a RECATOOLS calculator or AI-directory entry so you can act on it.

498 guides published 17 topic areas Latest guide Oct 2026

Tagged Statistics · 4 guides

All 498 Developer Tools 68 AI & ML 63 Finance 52 Home & Living 46 Chinese Culture 43 Personality 9

A gloved hand holding a bag of donated blood beside collection equipment

Personality 6 min

Blood type explains almost none of the variation in large Japanese and US surveys

The belief that ABO blood type shapes temperament and compatibility has been popular in Japan since a 1971 book. In surv...

Amelia Wong

Pub. 7 Oct

A fountain pen nib resting on paper beside a bottle of ink

Personality 5 min

Why two websites give you different life path numbers

Numerology has two standard ways of doing the arithmetic, and for about one birthday in eight they disagree. The dispute...

Amelia Wong

Pub. 31 Aug

Two colleagues in dark jackets at an office desk, one standing and pointing into an open notebook while the other, seated at a laptop, looks at the same page.

Personality 7 min

What a DISC Profile Is Actually Shaped Like

Across all 83,521 possible results from our DISC test, the top two traits are within a point in 31%. Because ties break...

Amelia Wong

Pub. 16 Aug

A tennis ball resting on the white boundary line of a clay court, half on each side of it.

Personality 6 min

Why Your Personality Result Changes When You Retake It

A four-part label is two numbers passed through a threshold. We walked all 1,089 possible score pairs on our own attachm...

Amelia Wong

Pub. 13 Aug