Demanda

sc median yearsinrank

[pic]

reg median year year2

Source | SS df MS Number of obs = 10

-------------+------------------------------ F(2, 7) = 7.83

Model | 1.0105e+09 2 505270399 Prob > F = 0.0164

Residual | 451526853 7 64503836.2 R-squared = 0.6912-------------+------------------------------ Adj R-squared = 0.6029

Total | 1.4621e+09 9 162451961 Root MSE = 8031.4------------------------------------------------------------------------------

median | Coef. Std. Err. t P>|t| [95% Conf. Interval]

-------------+----------------------------------------------------------------year | 893.7845 974.1373 0.92 0.389 -1409.684 3197.253

year2 | 2.446869 29.57071 0.08 0.936 -67.47674 72.37047

_cons | 108052.8 5855.78618.45 0.000 94206.09 121899.6

. gen lyear= ln( year)

. gen lyear2= ln(year2)

. gen lcount= ln(count)

. gen lmedian= ln(median)

. reg lmedian lyear lyear2

Source |SS df MS Number of obs = 10

-------------+------------------------------ F( 1, 8) = 17.98

Model | .070954594 1 .070954594Prob > F = 0.0028

Residual | .031571742 8 .003946468 R-squared = 0.6921

-------------+------------------------------ Adj R-squared = 0.6536Total | .102526336 9 .011391815 Root MSE = .06282

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lmedian | Coef. Std. Err.t P>|t| [95% Conf. Interval]

-------------+----------------------------------------------------------------

lyear | (dropped)

lyear2 | .0348344 .0082153 4.24...