R strata()

1 개요[ | ]

R strata()

"Stratified Sampling"

method
srswor (기본값)	simple random sampling without replacement → 비복원 단순랜덤샘플링
srswr	simple random sampling with replacement → 복원 단순랜덤샘플링
poisson	Poisson sampling → 포아송 샘플링
systematic	systematic sampling → 체계적 샘플링

2 예시[ | ]

R

CPU

2.6s

MEM

113M

2.8s

Reload

Copy

summary(warpbreaks)

     breaks      wool   tension
 Min.   :10.00   A:27   L:18   
 1st Qu.:18.25   B:27   M:18   
 Median :26.00          H:18   
 Mean   :28.15                 
 3rd Qu.:34.00                 
 Max.   :70.00

Copy

table(warpbreaks$wool,warpbreaks$tension)

Copy

library(sampling)
s <- strata(warpbreaks,c("wool","tension"),size=c(2,2,2,2,2,2),method="srswor")
s

A data.frame: 12 × 5
	wool	tension	ID_unit	Prob	Stratum
	<fct>	<fct>	<int>	<dbl>	<int>
5	A	L	5	0.2222222	1
8	A	L	8	0.2222222	1
12	A	M	12	0.2222222	2
13	A	M	13	0.2222222	2
20	A	H	20	0.2222222	3
22	A	H	22	0.2222222	3
32	B	L	32	0.2222222	4
36	B	L	36	0.2222222	4
40	B	M	40	0.2222222	5
41	B	M	41	0.2222222	5
49	B	H	49	0.2222222	6
53	B	H	53	0.2222222	6

Copy

getdata(warpbreaks, s)

A data.frame: 12 × 6
	breaks	wool	tension	ID_unit	Prob	Stratum
	<dbl>	<fct>	<fct>	<int>	<dbl>	<int>
5	70	A	L	5	0.2222222	1
8	26	A	L	8	0.2222222	1
12	29	A	M	12	0.2222222	2
13	17	A	M	13	0.2222222	2
20	21	A	H	20	0.2222222	3
22	18	A	H	22	0.2222222	3
32	29	B	L	32	0.2222222	4
36	44	B	L	36	0.2222222	4
40	16	B	M	40	0.2222222	5
41	39	B	M	41	0.2222222	5
49	17	B	H	49	0.2222222	6
53	16	B	H	53	0.2222222	6

3 같이 보기[ | ]

4 참고[ | ]

https://www.rdocumentation.org/packages/sampling/versions/2.8/topics/strata