A common form of nonresponse in telephone surveys is...

A common form of nonresponse in telephone surveys is "ring-no-answer." That is, a call is made to an active number but no one answers. The Italian National Statistical Institute looked at nonresponse to a government survey of households in Italy during the periods January 1 to Easter and July 1 to August $31 .$ All calls were made between 7 and $10 \mathrm{p} \cdot \mathrm{M} .,$ but $21.4 \%$ gave "ring-no-answer" in one period versus $41.5 \%$ "ring-no-answer" in the other period. ${ }^{16}$ Which period do you think had the higher rate of no answers? Why? Explain why a high rate of nonresponse makes sample results less reliable.

Key Concepts

Nonresponse

Nonresponse refers to the phenomenon where potential survey respondents do not participate, resulting in missing data. This is critical because if nonresponse occurs systematically rather than at random, it can bias the results of the survey, as certain segments of the population may be underrepresented.

Nonresponse Bias

Nonresponse bias arises when the individuals who do not respond differ in meaningful ways from those who do. This bias can distort the survey results, making them less representative of the overall population. Higher nonresponse rates amplify this risk and undermine the validity of any conclusions drawn from the data.

Survey Timing

The time frame during which a survey is conducted can significantly impact response rates. Factors such as holidays, work schedules, or other temporal dynamics can lead to differences in participation rates. Understanding survey timing helps researchers adjust for variations in response behavior, as seen when comparing calls made during different periods.

Reliability of Survey Results

Reliability in survey research refers to the consistency and dependability of the results. A high rate of nonresponse can compromise reliability because the missing data may not be randomly distributed. This loss of data from certain groups makes repeated measures less consistent and the overall survey findings less trustworthy.

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