[英]Fill data based on random forest object predicted response
Using randomForest
, I get an RF object. 使用randomForest
,我得到一个RF对象。
Eg forest <- randomForest(as.formula(generic),data=train, mtry=2)
) 例如, forest <- randomForest(as.formula(generic),data=train, mtry=2)
)
Using predict
I can predict the response on a test dataset. 使用predict
我可以预测测试数据集的响应。
The response is either A,B or C. 响应是A,B或C.
prediction <- predict(forest, newdata=test, type='class')
mytable <- table(test$class_w,prediction)
sum(mytable[row(mytable) != col(mytable)]) / sum(mytable)#show error
Calling the forest object I get the confusion matrix: 调用forest对象我得到了混淆矩阵:
A B C class.error
A 498 79 170 0.3333333
B 115 353 237 0.4992908
C 96 99 967 0.1678141
Eg test dataset : 例如测试数据集 :
id |class_w| valueA | valueB |
1 | C | 0.254 | 0.334 |
2 | A | 0.654 | 0.334 |
3 | A | 0.554 | 0.314 |
4 | B | 0.454 | 0.224 |
5 | C | 0.354 | 0.332 |
6 | C | 0.264 | 0.114 |
7 | C | 0.264 | 0.664 |
I would like to know if I can create a new dataset with 2 columns the id of the previous dataset and the predicted response (the RF gave). 我想知道我是否可以创建一个新的数据集,其中包含2列前一个数据集的id和预测的响应(RF给出)。 Eg 例如
row id of test dataset | predicted response
1 | A #failed
2 | B #failed
3 | B #failed
4 | B #TRUE!
Thanks in advance for your help. 在此先感谢您的帮助。
I think you may simply be looking to create a new data frame: 我想你可能只是想创建一个新的数据框:
data.frame(id = test$id,response = prediction)
That assumes that id
is in fact a column in test
, rather than the row names. 这假设id
实际上是test
一列,而不是行名。 If they are rownames, then you'd want to do: 如果他们是rownames,那么你想做:
data.frame(id = rownames(id),response = prediction)
An another way to do that would be to just write something like this: 另一种方法是写下这样的东西:
yourNewDataSet$someNewColumnCreated= Predict(forest,yourNewDataSet,type="class")
This should give you a new column in your new dataset named 'someNewColumnCreated' 这应该会在新数据集中为您提供一个名为“someNewColumnCreated”的新列
that will contain all the prediction of your model when applied to this new data set. 这将包含应用于此新数据集时模型的所有预测。
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