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Official Journal of the Japan Wood Research Society

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Table 2 Results from analysis of the impact of economic level on paper and paperboard demand

From: Socioeconomic factors influencing global paper and paperboard demand

Use Regression model Estimation method Adj. R 2 a b 1 b 2 b 3 b 4
Newsprint paper Linear Fixed 0.4798 6.36e−03** 3.49e−07**
Quadratic Random 0.5198 −1.52e−03* 1.34e−06** −1.80e−11*
Cubic Random 0.5195 −1.72e−03 2.28e−17** −2.01e−11** 1.39e−06
Logarithmic Random 0.4378 −3.12e−02** 4.67e−03**
Printing and writing paper Linear Fixed 0.5858 −3.34e−03** 1.86e−06**
Quadratic Fixed 0.6081 −1.35e−02** 3.37e−06** −2.54e−11**
Cubic Fixed 0.6007 −1.87e−01** 4.51e−06** −6.67e−11** 4.19e−16**
Logarithmic Fixed 0.4625 −1.78e−01** 2.34e−02**
Sanitary paper Linear Random 0.3677 1.30e−03 2.88e−07**
Quadratic Fixed 0.4670 −2.97e−03** 8.87e−07** −9.33e−12**
Cubic Random 0.4667 1.10e−03 1.22e−07 1.56e−11** −2.37e−16**
Logarithmic Fixed 0.4020 −3.78e−01** 4.98e−03**
Wrapping paper and corrugated cardboard Linear Random 0.5055 5.76e−03** 1.78e−06**
Quadratic Fixed 0.6134 −1.40e−02** 5.39e−06** −5.92e−11**
Cubic Fixed 0.6144 −1.26e−02** 5.11e−06** −4.94e−11** −9.84e−17
Logarithmic Fixed 0.5091 −2.91e−02** 3.76e−02**
Other paper and paperboard Linear Fixed 0.1434 8.88e−03** −9.59e−08*
Quadratic Fixed 0.1468 8.95e−03** −1.04e−07 1.37e−13
Cubic Random 0.1648 1.53e−04 1.26e−06** −4.36e−11** 4.11e−16**
Logarithmic Fixed 0.1456 6.66e−03 9.44e−05
  1. “Fixed” denotes fixed-effects estimation and “Random” denotes random-effects estimation. Adj. R 2 denotes the adjusted coefficient of determination
  2. **,* 1 and 5% significance levels, respectively. The numbers of countries (n) and the total sample size (N) were 92 and 2112 for newsprint paper, 104 and 2607 for printing and writing paper, 84 and 1601 for sanitary paper, 113 and 2300 for wrapping paper and corrugated cardboard, and 66 and 1451 for other paper and paperboard, respectively