Let's pretend we have a data frame x with the columns employment and income in it. The commands x$job for the data in the job column and x$income for the data in the income column are typically used to refer to the data in the frame.
When referring to the same data, however, using the command attach(x) eliminates the need for the data frame's name and the $ symbol. As a result, in the R code, x$job becomes job and x$income becomes income.
The issue is that many R experts advise against using the attach() verb while programming in R.
What is the most important reason behind this? What should be substituted in its place?