Wald test* results for the equation (2)
| 2007 | 2011 | |
|---|---|---|
| Commodities | χ2 Statistics | χ2 Statistics |
| Food | 23.76† | 13.38† |
| Housing | 23.81† | 34.01† |
| Utilities | 4.83 | 11.58† |
| Transportation | 16.97† | 29.86† |
| Entertainment | 13.03† | 27.37† |
| Durable and non-durable goods | 10.67† | 17.79† |
| Clothing | 18.50† | 15.06† |
| Health | 2.79 | 5.27 |
| Education | 20.99† | 14.06† |
| Alcohol | 10.69† | 29.71† |
| Sample size | 8543 | 9918 |
*A parametric statistical test for the joint significance of parameters.
†These results are significant at the 5% level.