* cross-section data: weekly household expenditure on food and
* weekly household income from Griffiths, Hill and Judge,
* 1993, Table 5.2, p. 182.

table data(i, *)
        expenditure income
i1        9.46       25.83
i2       10.56       34.31
i3       14.81       42.50
i4       21.71       46.75
i5       22.79       48.29
i6       18.19       48.77
i7       22.00       49.65
i8       18.12       51.94
i9       23.13       54.33
i10      19.00       54.87
i11      19.46       56.46
i12      17.83       58.83
i13      32.81       59.13
i14      22.13       60.73
i15      23.46       61.12
i16      16.81       63.10
i17      21.35       65.96
i18      14.87       66.40
i19      33.00       70.42
i20      25.19       70.48
i21      17.77       71.98
i22      22.44       72.00
i23      22.87       72.23
i24      26.52       72.23
i25      21.00       73.44
i26      37.52       74.25
i27      21.69       74.77
i28      27.40       76.33
i29      30.69       81.02
i30      19.56       81.85
i31      30.58       82.56
i32      41.12       83.33
i33      15.38       83.40
i34      17.87       91.81
i35      25.54       91.81
i36      39.00       92.96
i37      20.44       95.17
i38      30.10      101.40
i39      20.90      114.13
i40      48.71      115.46
;