Research Article
Demand for Fresh Vegetables in the United States: 1970–2010
Table 2
Harvey LM tests of single-equation and overall system autocorrelation.
| | Equation | LA/AIDS model | First-differenced | | in levels | LA/AIDS Model | | Statistic | P value | Statistic | P value |
| | Cabbages | 0.009 | 0.922 | 1.546 | 0.203 | | Carrots | 6.230 | 0.012 | 0.258 | 0.611 | | Celery | 2.560 | 0.109 | 0.494 | 0.482 | | Cucumbers | 6.054 | 0.014 | 0.057 | 0.811 | | Lettuce | 9.153 | 0.002 | 1.077 | 0.299 | | Onions | 7.452 | 0.006 | 1.892 | 0.169 | | Peppers | 11.150 | 0.000 | 0.102 | 0.749 | | Tomatoes | 1.534 | 0.215 | 0.471 | 0.492 |
| | Overall system | 42.608 | 0.000 | 5.426 | 0.608 |
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Note: Null hypothesis tested: No autocorrelation.
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