R:使用as.formula修复模型中的模型调用 [英] R: fix model call in model using as.formula

问题描述

我有一个gls模型，在其中我为该模型分配了一个公式(来自另一个对象):

I have a gls model in which I assign a formula (from another object) to the model:

equation <- as.formula(aic.obj[row,'model'])
> equation
temp.avg ~ I(year - 1950)
mod1 <- gls(equation, data = dat)

> mod1
Generalized least squares fit by maximum likelihood
  Model: equation 
  Data: dat 
  Log-likelihood: -2109.276

但是我不希望模型"成为等式"，而是希望等式本身！我该怎么做?

However I do not want the "Model" to be "equation" but rather the quation itself! How do I do this??

推荐答案

您可以通过一些巧妙的语言处理来解决此问题.这将直接插入模型方程式来创建(未评估的)gls调用，然后对其进行评估.

You can fix this up with some nifty use of language mangling. This creates the (unevaluated) gls call with the model equation inserted directly, and then evaluates it.

cl <- substitute(gls(.equation, data=dat), list(.equation=equation))
mod1 <- eval(cl)

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