Table 1. Residential Natural Gas Demand, NGRCPUSX (bcf per household per day)
| Equation | DF Model | DF Error | SSE | MSE | Root MSE | R-Square | Adj R-Sq | Durbin-Watson |
| NGRCPUSX | 14 | 91 | 0.00188 | 0.00002067 | 0.0045466 | 0.9972 | 0.9968 | 1.124 |
| Parameter | Estimate | Approx. Std. Err. | 'T' Ratio | Label |
| NGRC_01 | 0.268104 | 0.001678 | 159.74 | CONSTANT |
| NGRC_HD | 0.005038 | 0.000286 | 17.61 | ((ZGHDPUS-ZGHNPUS)/ZSAJQUS) |
| NGRC_HD1 | 0.002445 | 0.000256 | 9.53 | LAG((ZGHDPUS-ZGHNPUS)/ZSAJQUS) |
| NGRC_06 | -0.00671 | 0.002219 | -3.02 | FEB = 1 if February, 0 otherwise |
| NGRC_07 | -0.06828 | 0.002244 | -30.43 | MAR = 1 if March, 0 otherwise |
| NGRC_08 | -0.13608 | 0.002329 | -58.43 | APR = 1 if April, 0 otherwise |
| NGRC_09 | -0.19449 | 0.002263 | -85.96 | MAY = 1 if May, 0 otherwise |
| NGRC_10 | -0.21929 | 0.002261 | -96.97 | JUN = 1 if June, 0 otherwise |
| NGRC_11 | -0.22991 | 0.002261 | -101.67 | JUL = 1 if July, 0 otherwise |
| NGRC_12 | -0.23262 | 0.002261 | -102.87 | AUG = 1 if August, 0 otherwise |
| NGRC_13 | -0.22714 | 0.002261 | -100.44 | SEP = 1 if September, 0 otherwise |
| NGRC_14 | -0.20162 | 0.002372 | -85.02 | OCT = 1 if October, 0 otherwise |
| NGRC_15 | -0.13353 | 0.002386 | -55.97 | NOV = 1 if November, 0 otherwise |
| NGRC_16 | -0.05599 | 0.002249 | -24.9 | DEC = 1 if December, 0 otherwise |
| Method of estimation: OLS
Period of estimation: January 1987 to January 1999 |
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Table 2. Commercial Natural Gas Demand, NGCCPUSX (bcf per commercial employee per day)
| Equation | DF Model | DF Error | SSE | MSE | Root MSE | R-Square | Adj R-Sq | Durbin-Watson |
| NGCCPUSX | 16 | 89 | 0.0009187 | 0.00001032 | 0.0032128 | 0.9966 | 0.996 | 2.114 |
| Parameter | Estimate | Approx. Std. Err. | 'T' Ratio | Label |
| NGCC_01 | 0.196193 | 0.001388 | 141.37 | CONSTANT |
| NGCC_HD | 0.003293 | 0.000239 | 13.76 | ((ZWHDPUS-ZWHNPUS)/ZSAJQUS) |
| NGCC_HD1 | 0.00191 | 0.000201 | 9.52 | LAG((ZWHDPUS-ZWHNPUS)/ZSAJQUS) |
| NGCC_D2 | 0.0039 | 0.009792 | 0.4 | D8912 |
| NGCC_06 | 0.000448 | 0.001308 | 0.34 | FEB = 1 if February, 0 otherwise |
| NGCC_07 | -0.04431 | 0.001597 | -27.75 | MAR = 1 if March, 0 otherwise |
| NGCC_08 | -0.08591 | 0.001745 | -49.24 | APR = 1 if April, 0 otherwise |
| NGCC_09 | -0.12433 | 0.001803 | -68.96 | MAY = 1 if May, 0 otherwise |
| NGCC_10 | -0.13902 | 0.001817 | -76.49 | JUN = 1 if June, 0 otherwise |
| NGCC_11 | -0.14152 | 0.001823 | -77.62 | JUL = 1 if July, 0 otherwise |
| NGCC_12 | -0.14397 | 0.001819 | -79.16 | AUG = 1 if August, 0 otherwise |
| NGCC_13 | -0.1414 | 0.001801 | -78.5 | SEP = 1 if September, 0 otherwise |
| NGCC_14 | -0.12481 | 0.001786 | -69.89 | OCT = 1 if October, 0 otherwise |
| NGCC_15 | -0.08379 | 0.001778 | -47.12 | NOV = 1 if November, 0 otherwise |
| NGCC_16 | -0.0354 | 0.001428 | -24.78 | DEC = 1 if December, 0 otherwise |
| NGCCPUSX_L1 | 0.460948 | 0.09311 | 4.95 | AR(1) Param. for NGCCPUSX |
| Method of estimation: OLS with AR(1) autocorrelation correction.
Period of estimation: January 1987 to January 1999. |
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Table 3. Industrial Natural Gas Demand (Including Nonutility Generators), NGINPUSX (bcf per day)
| Equation | DF Model | DF Error | SSE | MSE | Root MSE | R-Square | Adj R-Sq | Durbin-Watson |
| NGINPUSX | 18 | 87 | 22.69943 | 0.26091 | 0.5108 | 0.9573 | 0.949 | 2.00 |
| Parameter | Estimate | Approx. Std. Err. | 'T' Ratio | Label |
| NGIN_01 | 2.037639 | 0.74991 | 2.72 | CONSTANT |
| NGIN_HDD | 0.180337 | 0.03387 | 5.32 | (ZWHDPUS-ZWHNPUS)/ZSAJQUS |
| NGIN_NU | 0.140547 | 0.06547 | 2.15 | NGNUPUS |
| NGIN_Q | 4.992212 | 1.50457 | 3.32 | QSIC |
| NGIN_P | -0.47235 | 0.28184 | -1.68 | (NGEUDUS/RFEUDUS) |
| NGIN_R1 | 0.718337 | 0.06352 | 11.31 | LAG(NGINPUSX) |
| NGIN_06 | -0.06926 | 0.28314 | -0.24 | FEB = 1 if February, 0 otherwise |
| NGIN_07 | -2.18429 | 0.25212 | -8.66 | MAR = 1 if March, 0 otherwise |
| NGIN_08 | -1.64592 | 0.27252 | -6.04 | APR = 1 if April, 0 otherwise |
| NGIN_09 | -2.86541 | 0.27546 | -10.4 | MAY = 1 if May, 0 otherwise |
| NGIN_10 | -1.7256 | 0.32084 | -5.38 | JUN = 1 if June, 0 otherwise |
| NGIN_11 | -2.37193 | 0.32408 | -7.32 | JUL = 1 if July, 0 otherwise |
| NGIN_12 | -1.52966 | 0.34733 | -4.4 | AUG = 1 if August, 0 otherwise |
| NGIN_13 | -1.36463 | 0.32975 | -4.14 | SEP = 1 if September, 0 otherwise |
| NGIN_14 | -1.2949 | 0.32466 | -3.99 | OCT = 1 if October, 0 otherwise |
| NGIN_15 | -0.56574 | 0.31514 | -1.8 | NOV = 1 if November, 0 otherwise |
| NGIN_16 | -0.4298 | 0.29497 | -1.46 | DEC = 1 if December, 0 otherwise |
| NGINPUSX_L1 | -0.26741 | 0.11411 | -2.34 | AR(1) Param. for NGINPUSX |
| Method of estimation: OLS with AR(1) autocorrelation correction.
Period of estimation: January 1987 to January 1999. |
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Table 4. Natural Gas Lease and Plant Fuel Demand, NGLPPUSX (bcf per day)
| Equation | DF Model | DF Error | SSE | MSE | Root MSE | R-Square | Adj R-Sq | Durbin-Watson |
| NGLPPUSX | 15 | 90 | 0.25581 | 0.0028423 | 0.05331 | 0.8932 | 0.8766 | 1.989 |
| Parameter | Estimate | Approx. Std. Err. | 'T' Ratio | Label |
| NGLP_01 | 0.712882 | 0.33457 | 2.13 | CONSTANT |
| NGLP_D2 | 0.410954 | 0.06875 | 5.98 | D90ON |
| NGLP_LE | 0.042675 | 0.006619 | 6.45 | NGPRPUSX |
| NGLP_06 | -0.00471 | 0.01853 | -0.25 | FEB = 1 if February, 0 otherwise |
| NGLP_07 | -0.01322 | 0.02547 | -0.52 | MAR = 1 if March, 0 otherwise |
| NGLP_08 | -0.02354 | 0.02998 | -0.79 | APR = 1 if April, 0 otherwise |
| NGLP_09 | -0.03902 | 0.03369 | -1.16 | MAY = 1 if May, 0 otherwise |
| NGLP_10 | -0.04569 | 0.03566 | -1.28 | JUN = 1 if June, 0 otherwise |
| NGLP_11 | -0.05236 | 0.03737 | -1.4 | JUL = 1 if July, 0 otherwise |
| NGLP_12 | -0.0447 | 0.03721 | -1.2 | AUG = 1 if August, 0 otherwise |
| NGLP_13 | -0.03495 | 0.03551 | -0.98 | SEP = 1 if September, 0 otherwise |
| NGLP_14 | -0.00237 | 0.03162 | -0.07 | OCT = 1 if October, 0 otherwise |
| NGLP_15 | 0.032268 | 0.0254 | 1.27 | NOV = 1 if November, 0 otherwise |
| NGLP_16 | 0.038203 | 0.01899 | 2.01 | DEC = 1 if December, 0 otherwise |
| NGLPPUSX_L1 | 0.886136 | 0.04369 | 20.28 | AR(1) Param. for NGLPPUSX |
| Method of estimation: OLS with AR(1) autocorrelation correction.
Period of estimation: January 1987 to January 1999. |
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Table 5. Natural Gas Pipeline Fuel Demand, NGACPUSX (bcf per day)
| Equation | DF Model | DF Error | SSE | MSE | Root MSE | R-Square | Adj R-Sq | Durbin-Watson |
| NGACPUSX | 14 | 95 | 0.43026 | 0.0045291 | 0.0673 | 0.9804 | 0.9777 | 1.97 |
| Parameter | Estimate | Approx. Std. Err. | 'T' Ratio | Label |
| NGAC_01 | 1.23736 | 0.17845 | 6.93 | NGACPUS |
| NGAC_06 | 0.040671 | 0.0249 | 1.63 | FEB = 1 if February, 0 otherwise |
| NGAC_07 | -0.15597 | 0.04232 | -3.69 | MAR = 1 if March, 0 otherwise |
| NGAC_08 | -0.2697 | 0.06546 | -4.12 | APR = 1 if April, 0 otherwise |
| NGAC_09 | -0.46334 | 0.08241 | -5.62 | MAY = 1 if May, 0 otherwise |
| NGAC_10 | -0.50112 | 0.08599 | -5.83 | JUN = 1 if June, 0 otherwise |
| NGAC_11 | -0.52142 | 0.08366 | -6.23 | JUL = 1 if July, 0 otherwise |
| NGAC_12 | -0.52332 | 0.08246 | -6.35 | AUG = 1 if August, 0 otherwise |
| NGAC_13 | -0.55007 | 0.08236 | -6.68 | SEP = 1 if September, 0 otherwise |
| NGAC_14 | -0.54978 | 0.0719 | -7.65 | OCT = 1 if October, 0 otherwise |
| NGAC_15 | -0.40471 | 0.04449 | -9.1 | NOV = 1 if November, 0 otherwise |
| NGAC_16 | -0.19166 | 0.02541 | -7.54 | DEC = 1 if December, 0 otherwise |
| NGACPUSX_L1 | 0.880387 | 0.04838 | 18.2 | AR(1) Param. for NGACPUSX |
| NGAC_DM | 0.018693 | 0.00239 | 7.82 | Throughput |
| Method of estimation: OLS with AR(1) autocorrelation correction.
Period of estimation: January 1990 to January 1999. |
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Table 6. Exports of Natural gas, NGEXPUS (bcf per day)
| Equation | DF Model | DF Error | SSE | MSE | Root MSE | R-Square | Adj R-Sq | Durbin-Watson |
| NGEXPUS | 4 | 96 | 0.64181 | 0.0066855 | 0.08176 | 0.4094 | 0.391 | 2.1 |
| Parameter | Estimate | Approx. Std. Err. | 'T' Ratio | Label |
| NGEX_01 | 0.451353 | 0.02101 | 21.49 | CONSTANT |
| NGEX_09 | -0.09893 | 0.02788 | -3.55 | MAY = 1 if May, 0 otherwise |
| NGEXPUS_L1 | 0.611083 | 0.08244 | 7.41 | AR(1) Param. for NGEXPUS |
| Method of estimation: OLS with AR(1) autocorrelation correction.
Period of estimation: January 1991 to March 1999. |
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Table 7. Natural Gas in Underground Storage, NGUSPUSX (bcf)
| Equation | DF Model | DF Error | SSE | MSE | Root MSE | R-Square | Adj R-Sq | Durbin-Watson |
| NGUSPUSX | 1 | 131 | 786059 | 6000.5 | 77.46258 | 0.9852 | 0.9852 | 1.672 |
| Parameter | Estimate | Approx. Std. Err. | 'T' Ratio | Label |
| NGUS_R1 | 0.912386 | 0.03671 | 24.85 | LAG(NGUSPUS) |
| NGSI_01 | 1.989141 | 0.3668 | 5.42 | CONSTANT |
| Method of estimation: OLS.
Period of estimation: January 1988 to march 1999. |
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Table 8. Natural Gas Supply/Demand Balancing Item, BALITX (bcf per day)
| Equation | DF Model | DF Error | SSE | MSE | Root MSE | R-Square | Adj R-Sq | Durbin-Watson |
| BALITX | 13 | 72 | 153.28509 | 2.12896 | 1.4591 | 0.81 | 0.7784 | 2.036 |
| Parameter | Estimate | Approx. Std. Err. | 'T' Ratio | Label |
| NGBL_01 | -0.35519 | 0.52339 | -0.68 | CONSTANT |
| NGBL_06 | 4.087632 | 0.70909 | 5.76 | FEB = 1 if February, 0 otherwise |
| NGBL_07 | 2.124044 | 0.75684 | 2.81 | MAR = 1 if March, 0 otherwise |
| NGBL_09 | 1.954012 | 0.76461 | 2.56 | MAY = 1 if May, 0 otherwise |
| NGBL_10 | 1.321404 | 0.76476 | 1.73 | JUN = 1 if June, 0 otherwise |
| NGBL_11 | 0.050027 | 0.76478 | 0.07 | JUL = 1 if July, 0 otherwise |
| NGBL_12 | -0.32586 | 0.76475 | -0.43 | AUG = 1 if August, 0 otherwise |
| NGBL_13 | -1.07844 | 0.76459 | -1.41 | SEP = 1 if September, 0 otherwise |
| NGBL_14 | -3.31515 | 0.76346 | -4.34 | OCT = 1 if October, 0 otherwise |
| NGBL_15 | -5.26203 | 0.75581 | -6.96 | NOV = 1 if November, 0 otherwise |
| NGBL_16 | -3.50047 | 0.70199 | -4.99 | DEC = 1 if December, 0 otherwise |
| BALITX_1 | 0.148109 | 0.11612 | 1.28 | AR(1) Param. for BALITX |
| Method of estimation: OLS with AR(1) autocorrelation correction.
Period of estimation: January 1992 to February 1999. |
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Table 9. Natural Gas Supplemental Fuel Supply, NGSFPUS ( bcf per day)
| Equation | DF Model | DF Error | SSE | MSE | Root MSE | R-Square | Adj R-Sq | Durbin-Watson |
| NGSFPUS | 13 | 120 | 0.04772 | 0.0003977 | 0.01994 | 0.8781 | 0.8659 | 2.366 |
| Parameter | Estimate | Approx. Std. Err. | 'T' Ratio | Label |
| NGSF_01 | 0.3875 | 0.007365 | 52.61 | CONSTANT |
| NGSF_06 | -0.0193 | 0.00662 | -2.92 | FEB = 1 if February, 0 otherwise |
| NGSF_07 | -0.04796 | 0.008373 | -5.73 | MAR = 1 if March, 0 otherwise |
| NGSF_08 | -0.09097 | 0.009263 | -9.82 | APR = 1 if April, 0 otherwise |
| NGSF_09 | -0.12783 | 0.00974 | -13.12 | MAY = 1 if May, 0 otherwise |
| NGSF_10 | -0.13344 | 0.009978 | -13.37 | JUN = 1 if June, 0 otherwise |
| NGSF_11 | -0.12037 | 0.01005 | -11.98 | JUL = 1 if July, 0 otherwise |
| NGSF_12 | -0.1248 | 0.009977 | -12.51 | AUG = 1 if August, 0 otherwise |
| NGSF_13 | -0.13167 | 0.009739 | -13.52 | SEP = 1 if September, 0 otherwise |
| NGSF_14 | -0.09876 | 0.009261 | -10.66 | OCT = 1 if October, 0 otherwise |
| NGSF_15 | -0.05562 | 0.008371 | -6.64 | NOV = 1 if November, 0 otherwise |
| NGSF_16 | -0.01361 | 0.006618 | -2.06 | DEC = 1 if December, 0 otherwise |
| NGSFPUS_L1 | 0.620994 | 0.07185 | 8.64 | AR(1) Param. for NGSFPUS |
| Method of estimation: OLS with AR(1) autocorrelation correction.
Period of estimation: January 1988 to February 1999. |
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Table 10. Imports of Natural Gas, NGIMPUSX (bcf per day)
| Equation | DF Model | DF Error | SSE | MSE | Root MSE | R-Square | Adj R-Sq | Durbin-Watson |
| NGIMPUSX | 14 | 110 | 10.03211 | 0.0912 | 0.30199 | 0.9735 | 0.9703 | 2.208 |
| Parameter | Estimate | Approx. Std. Err. | 'T' Ratio | Label |
| NGIM_01 | -3.42259 | 0.59428 | -5.76 | CONSTANT |
| NGIM_T | 0.045798 | 0.002531 | 18.1 | TIME |
| NGIM_06 | -0.16582 | 0.09742 | -1.7 | FEB = 1 if February, 0 otherwise |
| NGIM_07 | -0.5333 | 0.12709 | -4.2 | MAR = 1 if March, 0 otherwise |
| NGIM_08 | -0.66539 | 0.14398 | -4.62 | APR = 1 if April, 0 otherwise |
| NGIM_09 | -0.92954 | 0.15624 | -5.95 | MAY = 1 if May, 0 otherwise |
| NGIM_10 | -0.98742 | 0.16263 | -6.07 | JUN = 1 if June, 0 otherwise |
| NGIM_11 | -0.98692 | 0.16481 | -5.99 | JUL = 1 if July, 0 otherwise |
| NGIM_12 | -0.95327 | 0.16341 | -5.83 | AUG = 1 if August, 0 otherwise |
| NGIM_13 | -0.81122 | 0.15831 | -5.12 | SEP = 1 if September, 0 otherwise |
| NGIM_14 | -0.72831 | 0.14854 | -4.9 | OCT = 1 if October, 0 otherwise |
| NGIM_15 | -0.30185 | 0.13169 | -2.29 | NOV = 1 if November, 0 otherwise |
| NGIM_16 | -0.09924 | 0.10148 | -0.98 | DEC = 1 if December, 0 otherwise |
| NGIMPUSX_L1 | 0.716946 | 0.07015 | 10.22 | AR(1) Param. for NGIMPUSX |
| Method of estimation: OLS with AR(1) autocorrelation correction.
Period of estimation: January 1989 to February 1999. |
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File last modified: May 18, 1999
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