A series of problem

[Lielz Wu]

(a) Run the regression with all years
(c) Test if the coefficients on on-base percentage and slugging are equal. (d) Rerun the regression for each year separately saving the coefficients on OBP and SLG for each year.
I am little confused about the regress command, is it can only regress one variable at a time? It doesn't work when I tried to regress (all variable names isolated with space) but it doesn't work.

[daniel klein]

Please read the FAQs carefully; especially #7, #12, and perhaps, first of all, #4 here.

Best
Daniel

[Lielz Wu]

Please read the FAQs carefully; especially #7, #12, and perhaps, first of all, #4 here.

Best
Daniel

This is an assignment but it is not required to be completed by one's own.

[Lielz Wu]

This is an assignment but it is not required to be completed by one's own.

Thank you for your information.

[Joseph Coveney]

This is an assignment but it is not required to be completed by one's own.

I recommend that you read the help file and user's manual entry for each example of syntax illustrated below, and prepare yourself to describe to your instructor how each is used in the assignment. (The last is not exactly in accordance with your instructor's assignment, but is how I would approach the objective.)

version 15.1

clear *

set seed `=strreverse("1488467")'

quietly set obs 3
generate byte year = _n

quietly expand 4
generate double whatever = rnormal()

generate double obp = runiform()
generate double slg = runiform()

*
* Begin here
*
// "Run the regression with all years"
regress whatever c.(obp slg) i.year

// What happened 2B?

// "Test if the coefficients on on-base percentage and slugging are equal"
test _b[obp] = _b[slg]

// "Rerun the regression for each year separately saving the coefficients on OBP and SLG for each year"
regress whatever c.(obp slg)##i.year
margins , dydx(obp slg) over(year) post

exit

It will help to familiarize yourself with each syntax element on other datasets and with variations on the problem on your own.

help regress
help factor variables
help test
help margins