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Sample
Method of sampling: county level units are chosen by PPS (Probability Proportional to Size), stratified by regions and urban/rural. Within each county, CHARLS randomly selects 3 village-level units by PPS; within each PSU, CHARLS then randomly selects 25-36 from a complete list of dwelling units generated from a map; then determines the number of households in each chosen dwelling unit. CHARLS randomly selects one with an age-eligible household; and then determines the number of age-eligible members within a household and randomly selects one. Based on this sampling procedure, there will be about 25–36 households in each community; and 1 or 2 individuals in each household who are interviewed depending on marital status in the household. Sample size: the pilot sample is 45 years and older from Zhejiang and Gansu provinces. There are about 2,685 individuals in 1,570 households in the sample representing both rural and urban settings and also distributed across the full age distribution of the sample. The table shows the Sample Size for CHARLS pilot by age and sex: Age Group | Male | Female | Total | Under 50 | 192 | 344 | 536 | 50~59 | 492 | 485 | 977 | 60~69 | 348 | 318 | 666 | 70~79 | 212 | 180 | 392 | 80 or Older | 56 | 54 | 110 | Total | 1302 | 1383 | 2685 |
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