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.
For a general list of signs and symptoms, visit our Seeking Services section. Below are specific symptoms associated with common mental health disorders. These lists are very brief â there are many and varied symptoms that can occur depending on the disorder someone is experiencing and the severity of their illness.