manufacturing

service

wholesale and retail

natural resources

N

312

203

32

36

windows

1

2

3

1

2

3

1

2

3

1

2

3

mean

0.3092***

0.2844***

0.2619***

0.1840***

0.1743***

0.1682***

0.2252***

0.2405***

0.2136***

0.1445**

0.1049***

0.1068***

t-statistics

(13.8258)

(18.1753)

(18.3555)

(8.3712)

(12.1562)

(13.5146)

(3.0059)

(5.3433)

(4.4905)

(2.5809)

(2.7929)

(3.8498)

p-statistics

(0.0000)

(0.0000)

(0.0000)

(0.0000)

(0.0000)

(0.0000)

(0.0047)

(0.0000)

(0.0001)

(0.0138)

(0.0081)

(0.0004)