Graziano and Raulin (8th ed)Graziano & Raulin
Research Methods (8th edition)

Glossary Items Starting with "U"

unbiased assignment
Assigning participants to groups or conditions in such a way that the groups are statistically equivalent at the start of the study. The most common unbiased assignment method is random assignment.

univariate
Having to do with one variable. For example, a univariate distribution would provide the distribution for a single variable.

univariate designs
See single-variable design.

unobtrusive measure
Any measure that can be taken on participants without them being aware they are being measured.

unobtrusive observer
Anyone who is able to observe the behavior of participants without them being aware they are being observed.