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.
Sometimes symptoms of a mental health disorder appear as physical problems, such as stomach pain, back pain, headache, or other unexplained aches and pains.
Mental Illness: Mental illness comes in a variety of forms accompanied by a number of related symptoms. Mental illnesses are some of the most misunderstood afflictions in today's society. Too many people think of mental illness as a weakness. Nothing could be further from the truth. These are true illnesses and brain diseases. Behavioral Health Resources primarily treats the following mental illnesses: Anxiety disorders are the most common and treatable mental health disorders, affecting more than 19 million people a year. There is a difference between everyday anxiety and anxiety disorders. People with anxiety disorders feel significant tension when there is no real danger and take extreme action to avoid the source of their anxiety.