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日期:2024-09-09
Chapter 7: Dummy variable regression. Why include a qualitative independent
variable?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ... R commands ....
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日期:2024-09-05
Version info: Code for this page was tested in R version 3.0.2 (2013-09-25) ... In
the case of the variable race which has four levels, a typical dummy coding ......
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日期:2024-09-07
2 Jan 2014 ... Algorithms such as randomForest in R often have limits on how many ... and
elsewhere, here's the answer: code your own dummy variables ......
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日期:2024-09-09
14 Jun 2012 ... Contains functions to create dummy variables flexibly using ... http://wiki.r-project.
org/rwiki/doku.php?id=tips:data-manip:create_indicator....
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日期:2024-09-07
Another option that can work better if you have many variables is factor and
model.matrix . > year.f = factor(year) > dummies = model.matrix(~year.f)....
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日期:2024-09-04
You can simply do: housetype$quality...
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日期:2024-09-10
2 Jan 2014 ... On Quora, a question was asked about how to fix the error of the randomForest
package in R not being able to handle more than 32 levels in a ......
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日期:2024-09-11
16 Apr 2014 ... Follow-up question (possibly answered by the above): besides just the efficiency
of letting R create dummy variables, is there any problem with ......