Telescoping Error in Recalled Food Consumption
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Published by Oxford University Press on behalf of the World Bank
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Telescoping errors occur if survey
respondents misdate events from outside the reference period
and include them in their recall. Concern about telescoping
influenced the design of early Living Standards Measurement
Study (LSMS) surveys, which used a two-visit interview
format to bound food consumption recall. This design fell
out of favor although not for evidence-based reasons. To
measure the extent of telescoping bias on food consumption
measures, a survey experiment was conducted in Addis Ababa,
Ethiopia, randomly assigning households to either a
two-visit bounded recall or a single visit unbounded recall.
The average value of reported food consumption is 16 percent
higher (95 percent CI: 7.4–25.9) in the unbounded single
visit recall relative to the two-visit bounded recall. Most
of the error is explained by difference in reported spending
on less frequently consumed, protein-rich foods, so apparent
food security indicators based on household diet diversity
are likely overstated with unbounded recall.
Palabras clave
DIET QUALITY, FOOD CONSUMPTION, HOUSEHOLD SURVEYS, RECALL, TELESCOPING