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Table 11 Results from the balancing of covariates describing the firms included in the study

From: Assessing the effects of price regulation and freedom of choice on quality: evidence from the physiotherapy market

Variable

Unmatched

Mean

  

t-test

  
 

Matched

Regulated

Non-regulated

%bias

reduct % bias

|t|

p > |t|

V (T)/V (C)

Competition

U

21,7330

65,828

−61,4

 

−4,74

***

0.03a

 
 

M

25,3920

17,706

10,7

82,6

1,66

 

0,59

 

Disabled individuals (municipality)

U

122,4500

234,24

−53,4

 

−4,27

***

0.11a

 
 

M

122,4500

140,16

14,5

72,9

1,39

 

0,62

 

Population

U

46148

1,10E + 05

−55,9

 

−4,36

***

0.05a

 
 

M

46148

47888

11,1

80,2

1,6

 

0,70

 

Number of staff

U

36,7270

8,361

25,9

 

4,93

***

18.63a

 
 

M

36,7270

4,9444

26,6

−2,4

1,09

 

17.12a

 

Average rental rate (municipality)

U

8,8493

10,065

−64,0

 

−5,39

***

0.25a

 
 

M

8,8493

8,9803

15,3

76,1

1,27

 

0,62

 

Risk rating

U

1,0189

1,1913

−27,3

 

−2,30

*

0.55a

 
 

M

1,0189

1,125

4,5

83,5

1,00

 

-a

 

Quality_2007

U

73,3420

68,786

40,0

 

4,32

***

1,23

 
 

M

73,3420

73,36

14,2

64,6

0,72

 

1,45

 

a if variance ratio outside [0.69; 1.44] for U and [0.57; 1.75] for M

Results are called by using psmatch2 in Stata

  

Ps R2

LR chi2

p > chi2

MeanBias

MedBias

B

R

% Var

Sample

Unmatched

 

0,119

74,01

0,000

46,9

53,4

75.1b

0.09b

86

Matched

 

0,039

5,46

0,486

13,8

14,2

46.1b

0,66

29

b if B > 25%, R outside [0.5; 2]