T-test of difference of means

Period

Technical Efficiency

Allocative Efficiency

Economic Efficiency

Equal Variances

Different Variances

Equal Variances

Different Variances

Equal Variances

Different Variances

Mar 01/Dec 01(1)

N/A

13.133

−1.9216*

N/A

−12.308

N/A

Dec 01/Sep 02(2)

0.8570

N/A

0.2661

N/A

0.4404

N/A

Sep 02/Mar 03(3)

0.317

N/A

−2.7503***

N/A

−2.0554**

N/A

Mar 03/Jun 04(4)

−10.030

N/A

0.5057

N/A

0.1181

N/A

Jun 04/Jun 05(5)

0.4792

N/A

0.681

N/A

0.6133

N/A

Jun 05/Dec 07(6)

−0.6767

N/A

N/A

4.4924***

N/A

3.6944***

Dec 07/Dec 08(7)

0.3489

N/A

N/A

−6.0966***

N/A

−5.2016***

Dec 08/Dec 09(8)

N/A

7.7137***

−10.686

N/A

2.6663***

N/A

Dec 09/Jun 11(9)

N/A

−7.1275***

3.4154***

N/A

−0.5271

N/A

Jun 11/Dec 12(10)

11,535

N/A

0.4388

N/A

10.166

N/A

Dec 12/Jun 14(11)

−1.8309*

N/A

15.131

N/A

0.7701

N/A