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A number of robustness checks using restricted samples confirm the results.
Married respondents are more than those who were never married in both the whole (52.8 to 35.2%%) and restricted samples (53 to 36.2 %).
Secondly, considering the differences in the social structure and cultural values between the urban and rural areas, we restricted samples into respondents with urban or rural Hukou.
As the forest understory conditions such as the light environment and leaf area distribution are spatially and temporally heterogeneous, the scaling up from spatially restricted samples to the entire landscapes requires new approaches for sampling.
The main conclusions on group differences in earnings trajectories and the role played by work history before the base year are essentially the same from these restricted samples as those from the unbalanced sample.
Specifically, only students who have been admitted to the university are included in the data, which means the datasets consist of restricted samples comprising only those whose TOEFL or IELTS scores achieved a certain level (above the cut-off score).
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From this restricted sample, they put down as "likely voters" people who said that they were "definitely" "very likely" voting this year.
237 Full sample n. 10,000 Restricted sample n. 2290 Callback rate n.
This reduction results in a correlation between MCK and MPCK of 0.48 for the restricted sample.
Finally, 66.1 % of the whole and 65.5 % of the restricted sample reside in major urban areas.
Table 1 shows the descriptive statistics for all variables of the total and restricted sample.
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