Data Collectionhard
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A mental health clinic surveys 600 patients about depression treatment outcomes, achieving an 80% response rate (480 respondents reporting improvement). Follow-up surveys of a random sample of non-respondents find their improvement rates are nearly identical to respondents. Additionally, missingness is unrelated to baseline characteristics (age, gender, initial severity). Which missing data mechanism is operating?
A mental health clinic surveys 600 patients about depression treatment outcomes, achieving an 80% response rate (480 respondents reporting improvement). Follow-up surveys of a random sample of non-respondents find their improvement rates are nearly identical to respondents. Additionally, missingness is unrelated to baseline characteristics (age, gender, initial severity). Which missing data mechanism is operating?