我想进行回归并将系数存储在data.table中。这是一个最小的示例:
library(data.table)
library(MASS)
dt <- as.data.table(iris)
dt[, c("coef1", "coef2") := rlm(Sepal.Length ~ Petal.Length)$coef]
dt
但是,它循环输出,因此coef1和coef2在每一行上都相同,但是两个系数在每隔一行上显示。
此示例显示了我的外观,但这并不是最佳选择,因为它需要运行两次回归:
dt <- as.data.table(iris)
dt[, `:=`("coef1"=rlm(Sepal.Length ~ Petal.Length)$coef[1], "coef2"=rlm(Sepal.Length ~ Petal.Length)$coef[2])]
dt
答案 0 :(得分:4)
您似乎想按行存储。试试这个:
library(data.table)
library(MASS)
dt <- as.data.table(iris)
dt[, c("coef1", "coef2") := as.list(rlm(Sepal.Length ~ Petal.Length)$coef)][]
dt
# output
Sepal.Length Sepal.Width Petal.Length Petal.Width Species coef1 coef2
1: 5.1 3.5 1.4 0.2 setosa 4.300878 0.4097214
2: 4.9 3.0 1.4 0.2 setosa 4.300878 0.4097214
3: 4.7 3.2 1.3 0.2 setosa 4.300878 0.4097214
4: 4.6 3.1 1.5 0.2 setosa 4.300878 0.4097214
5: 5.0 3.6 1.4 0.2 setosa 4.300878 0.4097214
---
146: 6.7 3.0 5.2 2.3 virginica 4.300878 0.4097214
147: 6.3 2.5 5.0 1.9 virginica 4.300878 0.4097214
148: 6.5 3.0 5.2 2.0 virginica 4.300878 0.4097214
149: 6.2 3.4 5.4 2.3 virginica 4.300878 0.4097214
150: 5.9 3.0 5.1 1.8 virginica 4.300878 0.4097214