return on common stockholders’ equity rate

operating cost rate

account payable turnover rate

research and development expenditure rate

income tax rate

return on total assets rate

X1

X2

X3

X4

X5

Y

2012

0.218

0.602

4.259

0.137

0.150

0.090

2013

0.260

0.590

4.433

0.128

0.165

0.114

2014

0.299

0.558

4.773

0.142

0.157

0.122

2015

0.337

0.583

4.617

0.151

0.121

0.123

2016

0.286

0.597

4.906

0.146

0.159

0.108

2017

0.301

0.605

5.056

0.149

0.155

0.118