covariate
C2CEFR level
80/100Rarity: very rare
TechnicalRegister
A variable that may influence the outcome and is controlled for in an analysis.
Once they added region as a covariate, the apparent effect of the promotion all but vanished.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
Get words like covariate on your lock screen, a few a day, with review that makes them stick.
Download on the App Store Lexfall puts a new word on your home and lock screen through widgets, so you learn without opening an app. Free to download. After a free trial, a subscription unlocks every field. Built for iPhone, iOS 15.1 or later.
On a computer?Scan with your iPhone camera.