Imagine you're a researcher studying how sleep affects mood. To explore the connection, you would look at two key "variables": sleep (how much someone gets) and mood (how happy or irritable they feel) ...

An empirical procedure is suggested for testing a model that postulates variables that intervene between observed causes and observed effects against a model that includes no such postulate. The ...

Previous research has shown a fairly consistent relationship between religion and/ or religiosity and attitudes towards abortion. Data from a 1972 national sample is presented showing the importance ...