firstinstinct

at the end of the comments of the post http://varianceexplained.org/r/teach-tidyverse/

compare base R:

  var1 <- "pounds"
  var2 <- "wt"
  mtcars[[var1]] <- mtcars[[var2]]/1000

  var1 <- sym("pounds")
  var2 <- sym("wt")
  mtcars <- mutate(mtcars,!!var1 := !!var/100)

  
 Watch your steps: !!, :=, sym.

What I see clearly is that is not a good option to begin with R inferno, except when you are a fighter prepared to learn at any cost.

A related post is http://varianceexplained.org/r/teach-tidyverse/

Put a lot of false food for the squirrels and estimate the squirrel population by how much false food they try to eat.

False food: It looks like fruit but taste very bad, it is suppose only one bite for each animal.

I cannot remember. I emailed him about some results, he said they were interesting, but later I discovered those results were already published. I told him : I will throw them to trash. Very impolite from my part!, that must be 20 years ago.

Long time ago I failed to solve this conjecture. Nice to see it have been solved. I shared some email with S. Hetdetniemi about some special cases. Good old times.

Perhaps the reason is they think they will be left behind?

Related: Our first instinct is far too often wrong (finantial times, 10 May 2019, Tim harford, pay walled article).

Another related article: Heads or Tails: The Impact of a Coin Toss on Major Life Decisions and Subsequent Happiness Steven D. Levitt https://www.nber.org/papers/w22487