mini stata commands

Question 1

hypothesis test for mean of variable being x

Answer 1

ttest varname == x

Question 2

hypothesis test for difference in means

Answer 2

ttest outcome, by (binaryvarname)

Question 3

hypothesis test for linear combination

Answer 3

lincom 2var1+3var2 for example

basically just lincom and then the combination

Question 4

hypothesis test for multiple hypotheses

Answer 4

test (varname = x) (varname = y)

Question 5

normal regression

Answer 5

reg outcome var1 var2, robust

Question 6

how to export a regression

Answer 6

reg command
outreg2 using namedoc.doc, sdec(4) bdec(4)

Question 7

how to run a regression within a range

Answer 7

reg outcome var1 var2, robust, if inrange(varname, lowerbound, upperbound)

Question 8

how to run fixed effects regression

Answer 8

egen panel_id = group(var1 var2)
xtset panel_id timevariableid

xtreg outcome interactionvarname i.timeidvariable, fe robust

Question 9

iv regression command

Answer 9

ivregress 2sls outcome (fake_regressor = z1 z2), robust

Question 10

predicted values

Answer 10

predict namethevar

Question 11

predicted residuals

Answer 11

predict residual, resid

Question 12

how to standardise

Answer 12

gen varname_standardised = varname/r(sd)

Question 13

how to log a variable

Answer 13

gen varname_log = ln(varname)

Question 14

scatter with line through

Answer 14

twoway (lfit outcome regressor) (scatter outcome regressor)

Question 15

regression discontinuity

Answer 15

gen fake_over = fake_regressor -1
gen over_one = fake_regressor >1
gen interact_RD = over_one * fake_over

reg outcome fake_over over_one interact_rd, robust

Question 16

diff in diff regression

Answer 16

gen interaction = i*r

reg outcome i r interaction, robust

Question 17

first differences

Answer 17

gen stuff from fe first

reg diff_outcome diff_fake_regressor, robust