Effect of numbering of return envelopes on participation, explicit refusals, and bias: experiment and meta-analysis http://t.co/485vM4ugHu
Effect of numbering of return envelopes on participation, explicit refusals, and bias: experiment and meta-analysis http://t.co/485vM4ugHu
Numbered return envelopes may reduce response rate & increase explicit refusals to participate in a sensitive survey http://t.co/6fC6pfoFdz
Numbered return envelopes may reduce response rate & increase explicit refusals to participate in a sensitive survey http://t.co/6fC6pfoFdz
Effect of numbering of return envelopes on participation, explicit refusals, and bias: experiment and meta-analysis http://t.co/485vM4ugHu
Effect of numbering of return envelopes on participation, explicit refusals, and bias: experiment and meta-analysis http://t.co/aHAN9XQ6xD
Do not number envelopes in social research. http://t.co/jzuhijGWtJ