Estimation of unobservable selection effects in on-line surveys through propensity score matching: An application to public acceptance of healthy eating policies.

After matching, the distance in support rates becomes larger (a median of -19% and negative values for all policy items, see Table B in S1 Appendix ), and the consequent increase in the proportion of neutrals (+6.7%) and opponents (+10.5%) is also larger and highly significant.

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