A Comparison of Los Angeles County Health Survey Outcomes After Transitioning From Telephone to a Primarily Web-Based, Self-Administration Data Collection Mode

Transitioning a population health survey from a telephone mode to a primarily self-administration mode using an ABS design comes with tradeoffs. Increased response rates and a greater ability to target lower-level geographies and other population domains of interest may be offset by mode effects that cannot be compensated for by weighting adjustments.