Lec33 2010 calculations (1)

# Lec33 2010 calculations (1) - = 1641 kJ/tkm Case 1 linear...

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Lec33 2010 calculations Space for calculations related to nonlinear regression Case study: food products. Use 1993 US data Value density: = total value shipped / total tons shipped = \$857bil. / 860mil = \$996/ton Energy intensity: = (64%truck)(2429kj/tkm) + (27%rail)(277kj/tkm) + (9%other)(130kj/tkm)

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Unformatted text preview: = 1641 kJ/tkm Case 1: linear regression (from Excel:) b = 0.0701; a = 1149.4 Conclusion: poor fit Case 2: log-linear regression Log-10(x) = log-10(996.5) = 2.998 (from Excel:) b = 522.6; a = -107 Conclusi on: better fit...
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