noun. in statistics, a circumstance where an impact is entirely lost in conjunction with yet another impact in a means which the two are not able to be separated from each other.
ALIAS: “The study examined depression in rats, half of which were exposed to light daily and half kept in the dark- while the results did conclude that more rats kept in the dark showed signs of depression than those in the light, other alias factors such as a biological predisposition to depression or it’s symptoms could not be ruled out.”