Stratified sampling is often used when one or more of the stratums in the population have a low incidence relative to the other stratums. Convenience sampling is used in exploratory research where the researcher is interested in getting an inexpensive approximation of the truth.
Millions of Americans live with various types of mental illness and mental health problems, such as social anxiety, obsessive compulsive disorder, drug addiction, and personality disorders. Treatment options include medication and psychotherapy.
Mental Health Problem Symptoms, Causes and Effects. Mental health problems can cover a broad range of disorders, but the common characteristic is that they all affect the affected personâs personality, thought processes or social interactions. They can be difficult to clearly diagnose, unlike physical illnesses.