共 8 条
[2]
[Anonymous], 2018, INT US
[5]
On the two different aspects of the representative method: The method of stratified sampling and the method of purposive selection.
[J].
JOURNAL OF THE ROYAL STATISTICAL SOCIETY,
1934, 97
:558-625
[6]
Office for National Statistics Statistical, 2020, COVID 19 PROD STAT S
[8]
Townsend E, 2020, LANCET PSYCHIAT, V7, P381, DOI 10.1016/S2215-0366(20)30150-4