R做线性回归的置换检验时不再有截距项有大神知道是为什么吗?怎么理解这种情况?
Call:
lmp(formula = weight ~ height + I(height^2), data = women, perm = "Prob")
Residuals:
Min 1Q Median 3Q Max
-0.509405 -0.296105 -0.009405 0.286151 0.597059
Coefficients:
Estimate Iter Pr(Prob)
height -7.34832 5000 <2e-16 ***
I(height^2) 0.08306 5000 <2e-16 ***
---
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
Residual standard error: 0.3841 on 12 degrees of freedom
Multiple R-Squared: 0.9995, Adjusted R-squared: 0.9994
F-statistic: 1.139e+04 on 2 and 12 DF, p-value: < 2.2e-16