Clifton had been experiencing a number of psychological issues, so he decided to go to a psychiatrist to see what was wrong. Dr. A told him he had major depressive disorder. He decided to seek a second opinion. Dr. B diagnosed him with generalized anxiety disorder. Wanting yet another opinion, he went to Dr. C, who told him he was obsessive-compulsive. This demonstrates

A. poor test-retest reliability.
B. inter-rater reliability.
C. descriptive validity.
D. concurrent validity.

Inter-rater reliability is a commitment between rater and judges. if everybody agrees then inter-rater will be 100% or 1. If everyone disagrees then it will be 0% or 0. The main disadvantage it could not give any chance of agreement, and overestimated the agreement. It is referred to as the measurement of statistical data. A rater is become who collects the data or measuring data on animals, human behavior, skills, etc. It is very important for the rater to be close to the observation. If the rater is not found closer to each other than measurement will be different and have to refined all the data . In many cases the rater has been trained that how to collect, measure the data so all rater do it at the same level.