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我有一个问题,当我用我的模型做一些预测时,R显示这条消息Warning message prediction from a rank-deficient fit may be misleading
,我该如何解决它?我认为我的模型是正确的是预测失败,我不知道为什么。如何在R中的线性模型上求解“等级缺陷拟合可能是误导误差”?
在这里你可以走一步看一步,我做什么,模型的总结:
myModel <- lm(margin~.,data = dataClean[train,c(target,numeric,categoric)])
Call:
lm(formula = margin ~ ., data = dataClean[train, c(target, numeric, categoric)])
Residuals:
Min 1Q Median 3Q Max
-0.220407 -0.035272 -0.003415 0.028227 0.276727
Coefficients: (2 not defined because of singularities)
Estimate Std. Error t value Pr(>|t|)
(Intercept) 6.061e-01 2.260e-02 26.817 < 2e-16 ***
price 1.042e-05 8.970e-06 1.162 0.245610
shipping 1.355e-03 2.741e-04 4.943 9.25e-07 ***
categoryofficeSupplies -7.721e-02 2.295e-02 -3.364 0.000802 ***
categorytechnology -3.993e-02 2.325e-02 -1.717 0.086249 .
subCategorybindersAndAccessories -1.650e-01 1.421e-02 -11.612 < 2e-16 ***
subCategorybookcases 3.337e-04 2.328e-02 0.014 0.988565
subCategorychairsChairmats -3.104e-02 2.106e-02 -1.474 0.140831
subCategorycomputerPeripherals 1.356e-02 1.293e-02 1.049 0.294604
subCategorycopiersAndFax -1.943e-01 2.944e-02 -6.598 7.27e-11 ***
subCategoryenvelopes -1.648e-01 2.045e-02 -8.057 2.62e-15 ***
subCategorylabels -1.534e-01 1.984e-02 -7.730 3.00e-14 ***
subCategoryofficeFurnishings -8.827e-02 2.220e-02 -3.976 7.61e-05 ***
subCategoryofficeMachines -1.521e-01 1.639e-02 -9.281 < 2e-16 ***
subCategorypaper -1.624e-01 1.363e-02 -11.909 < 2e-16 ***
subCategorypensArtSupplies -8.484e-04 1.524e-02 -0.056 0.955623
subCategoryrubberBands 3.174e-02 2.245e-02 1.414 0.157854
subCategoryscissorsRulersTrimmers 1.092e-01 2.327e-02 4.693 3.13e-06 ***
subCategorystorageOrganization 1.219e-01 1.575e-02 7.739 2.82e-14 ***
subCategorytables NA NA NA NA
subCategorytelephoneAndComunication NA NA NA NA
---
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
Residual standard error: 0.08045 on 858 degrees of freedom
Multiple R-squared: 0.6512, Adjusted R-squared: 0.6439
F-statistic: 88.98 on 18 and 858 DF, p-value: < 2.2e-16
estimateModel <- predict(myModel, type="response", newdata=dataClean[test, c(numeric,categoric,target)])
Warning message:
In predict.lm(myModel, type = "response", newdata = dataClean[test, :
prediction from a rank-deficient fit may be misleading
因此,您需要查找彼此之间具有100%相关性的字段或具有单个值的字段。你可以在这里找到更多的'理论' - http://stats.stackexchange.com/questions/35071/what-is-rank-deficiency-and-how-to-deal-with-it – Bulat
你可能会错过所有的训练样本中的“表”和“telephoneAndCommunication”行。 –