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Table 1 Evaluation of OW and FS in the empirical example

From: Comparison of two propensity score-based methods for balancing covariates: the overlap weighting and fine stratification methods in real-world claims data

Covariates

Crude

OWF

OWX

FSF−equ

FSX−equ

FSF−unequ

FSX−unequ

 

standardized mean difference (SMD)

 

Age

9.35

0.00

0.00

-0.88

-0.90

-2.00

-2.04

Distance

-28.37

0.02

0.02

-1.15

-1.21

-2.73

-2.87

N of elig months

-24.86

0.01

0.01

1.01

0.96

2.27

2.15

N of MC months

-21.38

0.01

0.01

1.30

1.26

2.92

2.83

Elixhauser score

-19.78

0.00

0.00

-0.56

-0.57

-1.30

-1.33

Female

-8.47

0.00

0.00

0.79

0.70

0.79

0.70

Race group

       

 White

-15.25

0.00

0.00

-1.07

-1.05

-1.07

-1.05

 Black

14.73

0.00

0.00

-1.83

-1.79

-1.83

-1.79

 American Indian

-1.88

0.00

0.00

-0.76

-0.44

-0.76

-0.44

 Asian

-7.66

0.00

0.00

-2.32

-2.29

-2.32

-2.29

 Hispanic

-0.71

0.00

0.00

2.99

2.94

2.99

2.94

 Unknown

4.36

0.00

0.00

0.3

0.22

0.28

0.22

Medicaid eligibility

      

 Blind/disabled

-2.51

0.00

0.00

-3.03

-3.16

-3.03

-3.16

 Adult

2.51

0.00

0.00

3.03

3.16

3.03

3.16

TANF

1.40

0.00

0.00

3.09

3.26

3.09

3.26

Urban

7.76

0.01

0.00

0.94

1.06

0.94

1.06

Insulin

-3.94

0.00

0.00

1.32

1.38

1.32

1.38

MB

0.52

0.00033

0.00031

0.0498

0.0499

0.0714

0.0716

N used

42,628

42,628

42,481

42,607

42,459

42,607

42,459

  1. Footnotes:
  2. 1. Crude = summarized by raw data without any balancing method; OW = overlap weighting method; FS = propensity score based fine stratification method
  3. 2. ‘F’ = a full set of data; ‘X’ = a subset of data after removing those unmatched
  4. 3. ‘equ’ = ATE with the equal weighting between groups; ‘unequ’ = ATE with the unequal weighting, where total weight in one group equivalent to the sample size in that group
  5. 4. MB = Mahalanobis balance.
  6. 5. N used = the total sample size that was used further for GLM analysis
  7. 6. TANF = temporary assistance for needy families