You estimate 4 different specifications of an econometric model by adding a variable each time and get the following results 
Which model appears to be correctly specified?
Definitions:
Mental Health Providers
Professionals who offer services for the treatment and management of psychological, emotional, and behavioral issues.
Paraprofessionals
Supportive workers who are not licensed as professionals but assist professionals, particularly in educational, legal, and health-care settings.
Psychiatrists
Medical doctors who specialize in diagnosing, treating, and preventing mental, emotional, and behavioral disorders, often using medication as part of treatment.
Clergy
Ordained leaders within a religious faith, tasked with performing spiritual functions, guidance, and services for a congregation or community.
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