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Table 3 Model summary and parameter estimates

From: The spread of COVID-19 outbreak in the first 120 days: a comparison between Nigeria and seven other countries

Country

Summary

Parameter Estimates

R Square

Constant

β1

β2

β3

Bangladesh

 Linear

0.767a

−33,018.645

1122.635

  

 Quadratic

0.987a

13,105.539

− 1222.663

20.045

 

 Cubic

0.999a

− 313.915

124.858

−8.625

0.163

 Exponential

0.915a

9.628

0.098

  

Egypt

 Linear

0.699a

− 8039.316

256.061

  

 Quadratic

0.956a

4274.644

− 349.544

5.005

 

 Cubic

0.995a

− 1566.637

218.015

−6.673

0.064

 Exponential

0.893a

2.352

0.094

  

Cameroun

 Linear

0.860a

− 2845.963

112.376

  

 Quadratic

0.992a

591.439

−59.494

1.444

 

 Cubic

0.993a

146.269

−15.528

.525

0.005

 Exponential

0.820a

15.465

0.069

  

Ghana

 Linear

0.894a

− 3633.083

156.014

  

 Quadratic

0.995a

268.922

−49.354

1.817

 

 Cubic

0.995a

183.709

− 40.501

1.622

0.001

 Exponential

0.853a

29.047

0.068

  

Indonesia

 Linear

0.887a

−10,357.170

422.333

  

 Quadratic

0.997a

1439.768

− 157.844

4.795

 

 Cubic

0.999a

− 550.761

35.562

.815

0.022

 Exponential

0.782a

56.394

0.069

  

Mexico

 Linear

0.823a

−50,669.386

1832.606

  

 Quadratic

0.995a

14,390.013

− 1447.700

27.799

 

 Cubic

1.000a

1958.116

− 209.705

1.682

0.148

 Exponential

0.868a

97.206

0.079

  

Nigeria

 Linear

0.785a

−4937.222

164.210

  

 Quadratic

0.991a

1748.194

−164.581

2.717

 

 Cubic

0.999a

151.233

−9.415

−.475

0.018

 Exponential

0.911a

2.245

0.090

  

South Africa

 Linear

0.667a

−29,085.662

929.637

  

 Quadratic

0.941a

17,807.574

− 1395.647

19.377

 

 Cubic

0.995a

− 7413.468

1074.917

−31.878

0.285

 Exponential

0.865a

50.331

0.075

  
  1. aSignificant at 0.1%