Follow your curiosity

What discovery has been shared with you?

FACTREE gives you something interesting to discover every day — and something worth talking about together.

Start with one fact. Explore it, go deeper, then follow whichever branch catches your imagination.

Choose subjects for a surprise

Exploring any topic

Begin your discovery

Your next discovery is one click away.

Choose one or more subjects above, or leave Any Topic selected and let curiosity decide.

Mathematics

Analysis of Covariance (ANCOVA) and Its Applications

Quick fact

ANCOVA can increase statistical power by reducing error variance, sometimes turning a non-significant difference into a significant one, by adjusting for a covariate that explains variability within groups.

Why this is interesting

You're comparing test scores between two teaching methods, but the groups differ in IQ. How can you fairly compare them without being biased by IQ?