英文:
How to reference a variable containing plus sign?
问题
数据集blood_storage来自包medicaldata，包含一个名为BN+的变量。我如何在模型的公式中原样输入该变量？以下代码将导致错误：
lm(TimeToRecurrence ~ RBC.Age.Group + Median.RBC.Age + Age + AA + FamHx + PVol + TVol + T.Stage +
bGS + BN+ + OrganConfined, data=blood_storage)
是否有解决办法，可以重命名变量以去除+符号？
英文:
The dataset blood_storage from the package medicaldata contains a variable BN+. How can I enter that variable as is in a model's formula? The following code will cause an error:
lm(TimeToRecurrence ~ RBC.Age.Group + Median.RBC.Age + Age + AA + FamHx + PVol + TVol + T.Stage +
bGS + BN+ + OrganConfined, data=blood_storage)
Is there a workaround of the variable must be renamed to remove the + sign?
答案1
得分: 1
答案相同，对于具有空格的变量，请使用反引号。
lm(TimeToRecurrence ~ RBC.Age.Group + Median.RBC.Age + Age + AA + FamHx + PVol + TVol + T.Stage + bGS + `BN+` + OrganConfined, data=blood_storage)
英文:
The answer is the same for variables that have spaces in them. Use backticks.
lm(TimeToRecurrence ~ RBC.Age.Group + Median.RBC.Age + Age + AA + FamHx + PVol + TVol + T.Stage + bGS + `BN+` + OrganConfined, data=blood_storage)
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