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<br /> STATA Documentation<br />

STATA DOCUMENTATION ECONOMICS 2016

To look stuff up, just press Ctrl + F and type what you’re looking for


Loading Data

import delimited C:\Users\cholz\Downloads\penn_aut.csv

or just import the data by using File > Import


Details of our data

sum dataset


Generating a variable

gen x = 0


Deleting variables

drop x


Overwriting values

replace x = z


Generating a sequence

egen x = seq(), f(1) t(61) b(1)


Linear Regression

reg y x1 x2


Interaction Effects (Regression)

reg pizza income age c.income#c.age – [inserts only the interaction term]

reg pizza income age c.income##c.age – [inserts the interaction term and all individual terms]


Scatterplot

scatter x y


Lines

line x y, legend(size(small))


Scatterplot with Regression Line

graph twoway (lfit x y) (scatter x y)

graph twoway (lfitci x y) (scatter x y)


Two-Sided F-Test

test x2 = 1


Change text strings to numeric

gen x_n = real(x)


Predict residuals

predict res, residuals


Male dummy

sum res if male == 1

sum res if male == 2


Overwrite a variable

replace x = y


Something we did

regr wage exper male school [aweight = std^(-2)]


Variance weighted least squares

vwls wage exper male school, sd(std)


One-sided test

Just divide test x == 0 by 2, you dummy.


Installing a package

ssc install outreg2


Create a nice table into your working directory

outreg2 using regtable, excel


Generate a variable out of the coefficients

gen betax1 = _b[x]


Create constraint

constraint 1 x1 + x2 == 2


Constrained regression (constraint)

cnsreg y x1 x2 x3, constraints(1)


Plot residuals against fitted values

rvfplot


Covariance matrix of the coefficients of the regression model

estat vce


Testing two coefficients

test (exper=0) (school=0)


QNORM quantile shit

qnorm res