Water Treatment Technologies and Their Costs - Global Drinking Water Management and Conservation - page 48

Table 3.8 Estimated regression coef cients
Coef cients HRC UV MF-UF Ozonation

b 1 0.3226 0.2653 0.4171 2.2107

(0.077) (0.025) (0.060) (0.000)

b 2 0.2503 0.6003 0.3048 0.381

− − − −

(0.027) (0.000) (0.003) (0.000)

R 2

0.946 0.975 0.853 0.999

R 2

0.919 0.968 0.829 0.999

S.E. b 1 0.115 0.076 0.180 0.065

S.E. b 2 0.042 0.048 0.061 0.009

No. of Observations 4 6 8 4

p-values in parentheses

Appendix B

Estimation results for Table 3.5 based on the model: yi i ¼ b 1 X b 2

þ e i where y i is the
average cost per cubic meter, Xi i is the capacity in cubic meters and

i

e i is the error

term, which satis es the standard Gaussian assumptions

Table 3.9 Estimated regression coefficients
Coef cients UV-based AOP

b 1 0.7576

(0.4357)

b 2 0.3394

(0.1397)

−

R 2 0.759

R 2

0.638

S.E. b 1 0.784

S.E. b 2 0.142

No of Observations 4

p-values in parenthesis

Appendix C

Estimation results for Table 3.7 based on the model: yi i ¼ b 1 X b i þ e i where y i is the
average cost per cubic meter, Xi i is the capacity in cubic meters and e i is the error

term, which satis es the standard Gaussian assumptions