data =

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.

-- Jerome Anderson

	[[alternative HTML version deleted]]