Psychometric Theory by Jum C. Nunnally and Ira H. Bernstein is widely considered the "gold standard" for measurement in psychology and education. Whether you're a graduate student or a researcher, this text is the go-to resource for understanding how to build and validate reliable psychological scales. Where to Find the Text Online
: Covers traditional scaling, linear combinations, and multiple regression to explain how variables interact. Measurement Error psychometric theory nunnally pdf
: Ensuring the test items represent the entire domain of the construct. Psychometric Theory by Jum C