» run C:\Work\oebgas\Specification\DR_TC; ******************************************************************************** Date: 6/02/07 **** STANDARD SUR ESTIMATION RESULTS **** Time: 14:14:38 OUTPUT FILE:C:\work\Oebgas\results\out DATA FILE:C:\work\Oebgas\oebgas5.xls ******************************************************************************** DEFINITIONS OF OUTPUT VARIABLES: Y1 is number of customers. Y2 is weather adjusted residential & commerical deliveries Y3 is other delivieries DEFINITIONS OF BUSINESS CONDITION VARIABLES: Z1 is % of non-iron miles in Dx miles Z2 is Number of Electric Customers Z3 is Urban Core Dummy Z4 is Miles of Distribution Main Model includes time trend. Time period used: 1994 through 2004 *************************************************************************** GAUSS Data Import Facility *************************************************************************** Begin import... Import completed Number of rows in input file: 413 Number of cases written to GAUSS data set: 412 Number of missing elements: 63 Number of variables written to GAUSS data set: 21 1 409 =============================================================================== SEEMINGLY UNRELATED REGRESSION WITH HETEROSKEDASTICITY 6/02/2007 2:14 pm =============================================================================== Data Set: C:\work\Oebgas\Temp_3.dat ------------------------------------------------------------------------------- DIVISOR USING N IN EFFECT RESTRICTIONS IN EFFECT ITER. # = 0 LOG OF DETERMINANT OF SIGMA = 5.11275375 ITER. # = 1 LOG OF DETERMINANT OF SIGMA = 5.04568801 ITER. # = 2 LOG OF DETERMINANT OF SIGMA = 5.04519685 ITER. # = 3 LOG OF DETERMINANT OF SIGMA = 5.04519232 ITER. # = 4 LOG OF DETERMINANT OF SIGMA = 5.04519227 ITER. # = 5 LOG OF DETERMINANT OF SIGMA = 5.04519226 ITER. # = 6 LOG OF DETERMINANT OF SIGMA = 5.04519226 ----------------------------------- Equation: 1 Dependent variable: C ----------------------------------- Total cases: 396 Valid cases: 396 Total SS: 316.905 Degrees of freedom: ---- R-squared: 0.974 Rbar-squared: 0.973 Residual SS: 8.310 Std error of est: 2.540 Durbin-Watson: 0.281 Estimated Standard Prob Variable Coefficient Error t-ratio >|t| -------------------------------------------------------------------- CONST 8.17505271 0.02334829 350.135 0.0000 WL 0.22987459 0.01456593 15.782 0.0000 WK 0.56352423 0.00604423 93.233 0.0000 Y1 0.49693688 0.04144028 11.992 0.0000 Y2 0.16900403 0.02953300 5.723 0.0000 Y3 0.02178039 0.01872864 1.163 0.2456 WLWL -0.30387040 0.12950832 -2.346 0.0195 WLWK -0.09134910 0.01398169 -6.533 0.0000 WKWK 0.15064930 0.01343241 11.215 0.0000 Y1Y1 0.12309241 0.03531011 3.486 0.0005 Y2Y2 -0.20167894 0.03895477 -5.177 0.0000 Y3Y3 0.01283309 0.01322626 0.970 0.3325 WLY1 0.03379176 0.01150265 2.938 0.0035 WLY2 -0.05377540 0.01058866 -5.079 0.0000 WLY3 0.00873990 0.00390267 2.239 0.0257 WKY1 -0.09882411 0.01443856 -6.844 0.0000 WKY2 0.08092479 0.01366382 5.923 0.0000 WKY3 0.02387772 0.00403789 5.913 0.0000 Z1 -0.82748207 0.07277882 -11.370 0.0000 Z2 -0.00703081 0.00111520 -6.305 0.0000 Z3 0.03468218 0.01452655 2.388 0.0174 Z4 0.22675061 0.03029204 7.485 0.0000 TREND -0.01238854 0.00211477 -5.858 0.0000 WLTREND -0.00032750 0.00279396 -0.117 0.9067 WKTREND 0.00640272 0.00099144 6.458 0.0000 ----------------------------------- Equation: 2 Dependent variable: SL ----------------------------------- Total cases: 396 Valid cases: 396 Total SS: 1.940 Degrees of freedom: ---- R-squared: 0.074 Rbar-squared: 0.092 Residual SS: 1.797 Std error of est: 2.368 Durbin-Watson: 0.405 Estimated Standard Prob Variable Coefficient Error t-ratio >|t| -------------------------------------------------------------------- CONST 0.22987459 0.01456593 15.782 0.0000 WL -0.30387040 0.12950832 -2.346 0.0194 WK -0.09134910 0.01398169 -6.533 0.0000 Y1 0.03379176 0.01150265 2.938 0.0035 Y2 -0.05377540 0.01058866 -5.079 0.0000 Y3 0.00873990 0.00390267 2.239 0.0257 TREND -0.00032750 0.00279396 -0.117 0.9067 ----------------------------------- Equation: 3 Dependent variable: SK ----------------------------------- Total cases: 396 Valid cases: 396 Total SS: 2.429 Degrees of freedom: ---- R-squared: 0.212 Rbar-squared: 0.228 Residual SS: 1.914 Std error of est: 2.975 Durbin-Watson: 0.344 Estimated Standard Prob Variable Coefficient Error t-ratio >|t| -------------------------------------------------------------------- CONST 0.56352423 0.00604423 93.233 0.0000 WL -0.09134910 0.01398169 -6.533 0.0000 WK 0.15064930 0.01343241 11.215 0.0000 Y1 -0.09882411 0.01443856 -6.844 0.0000 Y2 0.08092479 0.01366382 5.923 0.0000 Y3 0.02387772 0.00403789 5.913 0.0000 TREND 0.00640272 0.00099144 6.458 0.0000 ----------------------------------- Equation: 4 Dependent variable: SM ----------------------------------- Valid cases: 396 Degrees of freedom: ---- Estimated Standard Prob Variable Coefficient Error t-ratio >|t| -------------------------------------------------------------------- CONST 0.20660118 0.01465278 14.100 0.0000 WL 0.39521950 0.12972407 3.047 0.0026 WK -0.05930021 0.01270007 -4.669 0.0000 Y1 0.06503235 0.01189852 5.466 0.0000 Y2 -0.02714940 0.01112577 -2.440 0.0155 Y3 -0.03261761 0.00351438 -9.281 0.0000 -------------------------------------------------------------------- MEASURES OF GOODNESS-OF-FIT -------------------------------------------------------------------- AN UNCENTERED SYSTEM R-SQUARE 0.982 A CENTERED SYSTEM R-SQUARE 0.982 The results from the test of the null hypothesis that all slope coefficients in all equations are simultaneously equal to zero. Test statistic Prob > t ---------------------------------------- 1591.153 +DEN -------------------------------------------------------------------- VALIDATION OF REGULARITY CONDITIONS -------------------------------------------------------------------- Monotonicity of the Estimated Cost Function The number of observations for which each of the following predicted cost share is nonpositive is listed below Labor Capital Materials 0 0 0 (0.00 %) (0.00 %) (0.00 %) Concavity of the Estimated Cost Function The number of the observations for which the condition that the matrix of second order partial derivatives of the cost function with respect to input wages is negative semi-definite holds: 396 (100.00 %) Quasi-Concavity of the Estimated Cost Function The number of observations for which the condition that the cost function is strictly quasi-concave in input prices holds: 396 (100.00 %) Second Order Condition for Cost Minimization The number of the observations for which the condition that the bordered Hessian is negative definite holds: 396 (100.00 %) OUT-OF-SAMPLE PREDICTION OF TOTAL COST LEVEL PERFORMANCE LAST 3 YEARS Actual Predicted Difference t_ratio p_value Utility 8.307 8.673 -0.367 -4.403 0.000 East Ohio Gas 6.233 6.515 -0.282 -3.175 0.001 Madison Gas & Electric 8.819 9.085 -0.267 -2.981 0.001 NICOR 6.674 6.934 -0.260 -2.948 0.002 North Shore Gas 9.711 9.906 -0.195 -1.929 0.027 SOUTHERN CALIFORNIA GAS 6.802 6.975 -0.173 -2.119 0.017 Louisville Gas and Electric 7.533 7.700 -0.167 -1.961 0.025 Wisconsin Gas 8.443 8.574 -0.132 -1.539 0.062 Atlanta Gas Light 7.828 7.946 -0.118 -1.362 0.087 Questar (Mountain Fuel Supply) 7.322 7.434 -0.112 -1.301 0.097 Illinois Power 7.719 7.801 -0.082 -0.905 0.183 SAN DIEGO GAS & ELECTRIC 7.831 7.895 -0.064 -0.752 0.226 BALTIMORE GAS & ELECTRIC CO 8.895 8.930 -0.035 -0.400 0.345 Public Service Electric & Gas 7.179 7.212 -0.033 -0.386 0.350 Rochester Gas and Electric 6.599 6.631 -0.032 -0.362 0.359 Wisconsin Power & Light 7.353 7.379 -0.027 -0.311 0.378 People's Natural Gas 7.888 7.896 -0.008 -0.096 0.462 Northwest Natural Gas 7.200 7.205 -0.004 -0.049 0.481 COMMONWEALTH GAS 7.705 7.706 -0.001 -0.013 0.495 new Jersey Natural Gas 7.711 7.709 0.001 0.013 0.495 Alabama Gas 8.618 8.612 0.005 0.061 0.476 Consumers Power 8.521 8.491 0.029 0.337 0.368 Southwest Gas 8.632 8.602 0.029 0.308 0.379 Consolidated Edison 6.527 6.490 0.037 0.416 0.339 Orange & Rockland Utilities 7.072 7.035 0.037 0.385 0.350 Connecticut Natural Gas 7.096 7.051 0.045 0.488 0.313 Connecticut Energy 7.978 7.916 0.062 0.704 0.241 Washington Natural Gas 8.674 8.608 0.066 0.723 0.235 Peoples Gas Light 6.578 6.485 0.093 1.066 0.143 Pg Energy (Penn Gas & Water) 6.084 5.933 0.152 1.566 0.059 Central Hudson Gas 7.372 7.177 0.195 2.290 0.011 Public Service of North Carolina 7.028 6.791 0.237 2.570 0.005 Cascade Natural Gas 9.551 9.250 0.301 3.661 0.000 Pacific Gas & Electric 8.123 7.788 0.335 4.007 0.000 Niagra Mohawk 7.791 7.393 0.398 4.547 0.000 Peco (Philadelphia Electric) 8.511 8.062 0.449 5.888 0.000 Washington Gas Light RTS (sum of output elasticities) calculated at all data points sum yn yvrc yvoth utility 0.541 0.565 -0.055 0.030 ENBRIDGE 0.562 0.481 0.065 0.017 Peoples Gas Light 0.563 0.601 -0.072 0.034 NICOR 0.591 0.597 -0.031 0.025 Consumers Power 0.594 0.570 -0.006 0.031 Public Service Electric & Gas 0.598 0.510 0.094 -0.006 Washington Gas Light 0.604 0.525 0.050 0.028 East Ohio Gas 0.617 0.485 0.105 0.028 Consolidated Edison 0.635 0.444 0.168 0.023 Niagra Mohawk 0.644 0.527 0.057 0.060 UNION GAS 0.658 0.693 -0.080 0.045 Pacific Gas & Electric 0.670 0.273 0.406 -0.010 Connecticut Natural Gas 0.677 0.714 -0.088 0.050 SOUTHERN CALIFORNIA GAS 0.679 0.511 0.162 0.006 Questar (Mountain Fuel Supply) 0.683 0.444 0.231 0.008 Washington Natural Gas 0.687 0.599 0.070 0.018 Atlanta Gas Light 0.690 0.403 0.289 -0.003 People's Natural Gas 0.691 0.268 0.429 -0.006 North Shore Gas 0.699 0.426 0.267 0.006 Peco (Philadelphia Electric) 0.700 0.346 0.357 -0.003 COMMONWEALTH GAS 0.706 0.459 0.232 0.014 Wisconsin Gas 0.706 0.388 0.317 0.001 new Jersey Natural Gas 0.707 0.363 0.347 -0.003 Rochester Gas and Electric 0.713 0.472 0.233 0.008 BALTIMORE GAS & ELECTRIC CO 0.723 0.314 0.411 -0.001 Pg Energy (Penn Gas & Water) 0.724 0.243 0.480 0.001 Orange & Rockland Utilities 0.733 0.419 0.305 0.008 Illinois Power 0.737 0.274 0.485 -0.022 Madison Gas & Electric 0.743 0.399 0.350 -0.005 Louisville Gas and Electric 0.747 0.435 0.293 0.018 Northwest Natural Gas 0.748 0.584 0.145 0.018 Southwest Gas 0.753 0.296 0.462 -0.004 Connecticut Energy 0.777 0.428 0.332 0.017 Alabama Gas 0.781 0.419 0.361 0.001 Public Service of North Carolina 0.783 0.309 0.476 -0.002 Wisconsin Power & Light 0.800 0.162 0.642 -0.004 Central Hudson Gas 0.813 0.301 0.487 0.026 Cascade Natural Gas 0.825 0.486 0.318 0.021 SAN DIEGO GAS & ELECTRIC ****************************************************************************************************** ****************************************************************************************************** ****************************************************************************************************** » run C:\Work\oebgas\Specification\DR_TC; ******************************************************************************** Date: 6/07/07 **** STANDARD SUR ESTIMATION RESULTS **** Time: 10:55:16 OUTPUT FILE:C:\work\Oebgas\results\out DATA FILE:C:\work\Oebgas\oebgas5.xls ******************************************************************************** DEFINITIONS OF OUTPUT VARIABLES: Y1 is number of customers. Y2 is weather adjusted residential & commerical deliveries Y3 is other delivieries Y4 is Miles of Distribution Main DEFINITIONS OF BUSINESS CONDITION VARIABLES: Z1 is % of non-iron miles in Dx miles Z2 is Number of Electric Customers Z3 is Urban Core Dummy Model includes time trend. Time period used: 1994 through 2004 *************************************************************************** GAUSS Data Import Facility *************************************************************************** Begin import... Import completed Number of rows in input file: 413 Number of cases written to GAUSS data set: 412 Number of missing elements: 66 Number of variables written to GAUSS data set: 22 1 409 =============================================================================== SEEMINGLY UNRELATED REGRESSION WITH HETEROSKEDASTICITY 6/07/2007 10:55 am =============================================================================== Data Set: C:\work\Oebgas\Temp_3.dat ------------------------------------------------------------------------------- DIVISOR USING N IN EFFECT RESTRICTIONS IN EFFECT ITER. # = 0 LOG OF DETERMINANT OF SIGMA = 5.12358120 ITER. # = 1 LOG OF DETERMINANT OF SIGMA = 5.04805797 ITER. # = 2 LOG OF DETERMINANT OF SIGMA = 5.04745548 ITER. # = 3 LOG OF DETERMINANT OF SIGMA = 5.04745026 ITER. # = 4 LOG OF DETERMINANT OF SIGMA = 5.04745019 ITER. # = 5 LOG OF DETERMINANT OF SIGMA = 5.04745019 ITER. # = 6 LOG OF DETERMINANT OF SIGMA = 5.04745019 ----------------------------------- Equation: 1 Dependent variable: C ----------------------------------- Total cases: 396 Valid cases: 396 Total SS: 316.905 Degrees of freedom: ---- R-squared: 0.974 Rbar-squared: 0.973 Residual SS: 8.310 Std error of est: 2.253 Durbin-Watson: 0.282 Estimated Standard Prob Variable Coefficient Error t-ratio >|t| -------------------------------------------------------------------- CONST 8.16067912 0.02188898 372.821 0.0000 WL 0.22099364 0.01432891 15.423 0.0000 WK 0.55710267 0.00613199 90.852 0.0000 Y1 0.50838927 0.04027883 12.622 0.0000 Y2 0.22464922 0.02870384 7.826 0.0000 Y3 -0.02199443 0.02014221 -1.092 0.2755 Y4 0.21342775 0.03447222 6.191 0.0000 WLWL -0.44409543 0.12848850 -3.456 0.0006 WLWK -0.11374662 0.01424463 -7.985 0.0000 WKWK 0.17835761 0.01587100 11.238 0.0000 Y1Y1 0.36736353 0.05706070 6.438 0.0000 Y2Y2 -0.23978850 0.04016188 -5.971 0.0000 Y3Y3 -0.00574067 0.01388567 -0.413 0.6795 Y4Y4 -0.26319996 0.04870900 -5.404 0.0000 WLY1 0.08747791 0.01656923 5.280 0.0000 WLY2 -0.08411365 0.01189067 -7.074 0.0000 WLY3 0.01718623 0.00399137 4.306 0.0000 WLY4 -0.04541453 0.00940262 -4.830 0.0000 WKY1 -0.14735010 0.01885707 -7.814 0.0000 WKY2 0.10172310 0.01455194 6.990 0.0000 WKY3 0.01064822 0.00455228 2.339 0.0198 WKY4 0.05670857 0.01119117 5.067 0.0000 Z1 -0.97207158 0.07318609 -13.282 0.0000 Z2 -0.00662258 0.00110403 -5.999 0.0000 Z3 0.04959643 0.01318798 3.761 0.0002 TREND -0.01161628 0.00207056 -5.610 0.0000 WLTREND 0.00244300 0.00274540 0.890 0.3741 WKTREND 0.00665262 0.00101088 6.581 0.0000 ----------------------------------- Equation: 2 Dependent variable: SL ----------------------------------- Total cases: 396 Valid cases: 396 Total SS: 1.940 Degrees of freedom: ---- R-squared: 0.051 Rbar-squared: 0.072 Residual SS: 1.842 Std error of est: 2.383 Durbin-Watson: 0.417 Estimated Standard Prob Variable Coefficient Error t-ratio >|t| -------------------------------------------------------------------- CONST 0.22099364 0.01432891 15.423 0.0000 WL -0.44409543 0.12848850 -3.456 0.0006 WK -0.11374662 0.01424463 -7.985 0.0000 Y1 0.08747791 0.01656923 5.280 0.0000 Y2 -0.08411365 0.01189067 -7.074 0.0000 Y3 0.01718623 0.00399137 4.306 0.0000 Y4 -0.04541453 0.00940262 -4.830 0.0000 TREND 0.00244300 0.00274540 0.890 0.3741 ----------------------------------- Equation: 3 Dependent variable: SK ----------------------------------- Total cases: 396 Valid cases: 396 Total SS: 2.429 Degrees of freedom: ---- R-squared: 0.262 Rbar-squared: 0.279 Residual SS: 1.792 Std error of est: 3.206 Durbin-Watson: 0.347 Estimated Standard Prob Variable Coefficient Error t-ratio >|t| -------------------------------------------------------------------- CONST 0.55710267 0.00613199 90.852 0.0000 WL -0.11374662 0.01424463 -7.985 0.0000 WK 0.17835761 0.01587100 11.238 0.0000 Y1 -0.14735010 0.01885707 -7.814 0.0000 Y2 0.10172310 0.01455194 6.990 0.0000 Y3 0.01064822 0.00455228 2.339 0.0198 Y4 0.05670857 0.01119117 5.067 0.0000 TREND 0.00665262 0.00101088 6.581 0.0000 ----------------------------------- Equation: 4 Dependent variable: SM ----------------------------------- Valid cases: 396 Degrees of freedom: ---- Estimated Standard Prob Variable Coefficient Error t-ratio >|t| -------------------------------------------------------------------- CONST 0.22190368 0.01462011 15.178 0.0000 WL 0.55784206 0.12999887 4.291 0.0000 WK -0.06461099 0.01439411 -4.489 0.0000 Y1 0.05987219 0.01596177 3.751 0.0002 Y2 -0.01760945 0.01224916 -1.438 0.1521 Y3 -0.02783444 0.00385982 -7.211 0.0000 Y4 -0.01129404 0.00951559 -1.187 0.2367 -------------------------------------------------------------------- MEASURES OF GOODNESS-OF-FIT -------------------------------------------------------------------- AN UNCENTERED SYSTEM R-SQUARE 0.982 A CENTERED SYSTEM R-SQUARE 0.982 The results from the test of the null hypothesis that all slope coefficients in all equations are simultaneously equal to zero. Test statistic Prob > t ---------------------------------------- 1595.677 +DEN -------------------------------------------------------------------- VALIDATION OF REGULARITY CONDITIONS -------------------------------------------------------------------- Monotonicity of the Estimated Cost Function The number of observations for which each of the following predicted cost share is nonpositive is listed below Labor Capital Materials 0 0 0 (0.00 %) (0.00 %) (0.00 %) Concavity of the Estimated Cost Function The number of the observations for which the condition that the matrix of second order partial derivatives of the cost function with respect to input wages is negative semi-definite holds: 396 (100.00 %) Quasi-Concavity of the Estimated Cost Function The number of observations for which the condition that the cost function is strictly quasi-concave in input prices holds: 396 (100.00 %) Second Order Condition for Cost Minimization The number of the observations for which the condition that the bordered Hessian is negative definite holds: 396 (100.00 %) OUT-OF-SAMPLE PREDICTION OF TOTAL COST LEVEL PERFORMANCE LAST 3 YEARS Actual Predicted Difference t_ratio p_value Utility 8.307 8.680 -0.373 -4.468 0.000 East Ohio Gas 9.711 10.078 -0.367 -3.378 0.000 SOUTHERN CALIFORNIA GAS 6.233 6.488 -0.254 -2.916 0.002 Madison Gas & Electric 6.674 6.909 -0.235 -2.641 0.004 North Shore Gas 8.819 9.025 -0.207 -2.189 0.014 NICOR 8.895 9.086 -0.191 -2.192 0.014 Public Service Electric & Gas 7.533 7.710 -0.177 -2.066 0.020 Wisconsin Gas 7.322 7.468 -0.147 -1.693 0.045 Illinois Power 6.802 6.948 -0.146 -1.797 0.036 Louisville Gas and Electric 7.831 7.941 -0.111 -1.294 0.098 BALTIMORE GAS & ELECTRIC CO 7.828 7.932 -0.105 -1.211 0.113 Questar (Mountain Fuel Supply) 7.179 7.258 -0.079 -0.910 0.182 Rochester Gas and Electric 6.599 6.674 -0.075 -0.835 0.202 Wisconsin Power & Light 7.353 7.421 -0.068 -0.794 0.214 People's Natural Gas 8.443 8.510 -0.068 -0.762 0.223 Atlanta Gas Light 7.719 7.748 -0.029 -0.318 0.375 SAN DIEGO GAS & ELECTRIC 7.705 7.727 -0.022 -0.252 0.401 new Jersey Natural Gas 7.711 7.706 0.004 0.049 0.481 Alabama Gas 8.632 8.627 0.004 0.046 0.482 Consolidated Edison 7.200 7.183 0.017 0.204 0.419 COMMONWEALTH GAS 7.888 7.864 0.024 0.274 0.392 Northwest Natural Gas 7.978 7.949 0.029 0.337 0.368 Washington Natural Gas 8.674 8.632 0.043 0.467 0.320 Peoples Gas Light 8.618 8.563 0.054 0.602 0.273 Consumers Power 6.578 6.523 0.055 0.628 0.265 Pg Energy (Penn Gas & Water) 7.096 7.006 0.090 0.978 0.164 Connecticut Energy 6.527 6.434 0.093 1.056 0.146 Orange & Rockland Utilities 7.072 6.964 0.108 1.129 0.130 Connecticut Natural Gas 8.521 8.383 0.138 1.559 0.060 Southwest Gas 7.372 7.203 0.169 1.983 0.024 Public Service of North Carolina 7.028 6.823 0.205 2.167 0.015 Cascade Natural Gas 9.551 9.253 0.298 3.597 0.000 Pacific Gas & Electric 8.123 7.787 0.336 4.037 0.000 Niagra Mohawk 6.084 5.723 0.361 3.766 0.000 Central Hudson Gas 7.791 7.389 0.402 4.573 0.000 Peco (Philadelphia Electric) 8.511 8.100 0.411 5.254 0.000 Washington Gas Light RTS (sum of output elasticities) calculated at all data points sum yn yvrc yvoth ym utility 0.695 0.825 -0.062 -0.026 -0.042 NICOR 0.707 0.625 0.091 -0.034 0.024 UNION GAS 0.724 0.780 -0.015 -0.027 -0.015 Consumers Power 0.756 0.739 -0.042 -0.020 0.079 ENBRIDGE 0.768 0.622 0.084 -0.020 0.083 East Ohio Gas 0.794 0.769 0.106 -0.027 -0.054 Atlanta Gas Light 0.834 0.743 0.017 -0.024 0.097 Public Service Electric & Gas 0.839 0.355 0.224 -0.022 0.282 Niagra Mohawk 0.843 0.495 0.215 -0.023 0.157 Questar (Mountain Fuel Supply) 0.847 1.085 -0.072 -0.034 -0.133 Pacific Gas & Electric 0.868 0.360 0.298 -0.015 0.225 Washington Natural Gas 0.870 0.323 0.372 -0.021 0.195 Northwest Natural Gas 0.870 0.537 0.136 -0.011 0.209 Washington Gas Light 0.886 0.715 0.195 -0.028 0.004 Southwest Gas 0.888 1.166 -0.080 -0.033 -0.165 SOUTHERN CALIFORNIA GAS 0.889 0.376 0.299 -0.021 0.235 Wisconsin Gas 0.908 0.216 0.367 -0.013 0.338 People's Natural Gas 0.924 0.263 0.385 -0.018 0.293 Illinois Power 0.944 0.301 0.419 -0.021 0.244 Alabama Gas 0.951 0.228 0.451 -0.020 0.292 Public Service of North Carolina 0.957 0.283 0.341 -0.017 0.351 Peco (Philadelphia Electric) 0.961 -0.062 0.603 -0.022 0.443 Cascade Natural Gas 0.983 0.217 0.402 -0.008 0.372 new Jersey Natural Gas 0.986 0.116 0.437 -0.010 0.442 Rochester Gas and Electric 1.004 -0.073 0.511 -0.017 0.584 Pg Energy (Penn Gas & Water) 1.007 -0.076 0.589 -0.014 0.508 Wisconsin Power & Light 1.018 -0.149 0.534 -0.005 0.638 North Shore Gas 1.025 -0.141 0.508 -0.005 0.663 Connecticut Natural Gas 1.047 -0.184 0.599 -0.006 0.639 Madison Gas & Electric 1.047 -0.226 0.596 -0.009 0.687 Orange & Rockland Utilities 1.051 0.062 0.448 -0.011 0.551 COMMONWEALTH GAS 1.052 0.491 0.102 -0.015 0.475 Peoples Gas Light 1.053 0.411 0.300 -0.019 0.361 BALTIMORE GAS & ELECTRIC CO 1.063 0.174 0.439 -0.016 0.466 Louisville Gas and Electric 1.100 -0.087 0.573 -0.010 0.625 Connecticut Energy 1.149 0.538 0.151 -0.015 0.475 Consolidated Edison 1.163 -0.458 0.789 -0.006 0.839 Central Hudson Gas 1.171 0.477 0.401 -0.021 0.314 SAN DIEGO GAS & ELECTRIC