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Why was the sample size of medicine outlets expanded?

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Why was the sample size of medicine outlets expanded?

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Although the original sample size (20 medicine outlets per sector) was found to be nationally representative in the Peru validation study, the low availability of medicines observed in many surveys meant that there was less price data available for analysis than anticipated. As such, the sample size was increased (30 medicine outlets per sector) to ensure sufficient price data for robust analysis.

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