On 2025-10-03 7:54 p.m., R Jerome Anderson wrote:
I can code summary(midterm_df$hv109) and I get the summary of variable
hv109. No problem.
Yet when I write the code:
summary(hv109, data = midterm_df)
I get this error:
Error in h(simpleError(msg, call)) : error in evaluating the argument
'object' in selecting a method for function 'summary': object 'hv109' not
found
If I write the code summary('hv109', data = midterm_df), R treats hv109 as
if it were a character variable. It is not.
Page 521 in Andrews *Doing Data Science in R* shows the data = [df]
command. I thought it was straightforward. Why doesn't my code work?
Any help w/ this would be appreciated.
Not all functions support a `data` argument. You can read about the
`summary()` function using `?summary`, and none of the variations shown
there have `data` as an argument.
For cases like this, you can use the `with()` function, e.g.
with(midterm_df, summary(hv109))
`with()` temporarily attaches the columns of the dataframe as separate
variables.
Duncan Murdoch
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