Stat Computing > Stata > Notes3

Stata Class Notes 3.0
Getting Started in Statistics with Stata

getting started

use http://www.ats.ucla.edu/stat/stata/notes3/hsb2

describe

descriptive statistics / exploratory data analysis

summarize

summarize read write

summarize read, detail

tabulate prog, sum(read)

table prog, contents(n read mean read sd read)

stem read

histogram read

graph box read

frequency distributions & cross tabulation

tabulate read

tabulate prog

tabulate prog, nolabel

tab1 female prog ses

tabulate prog ses

tab2 prog ses female

by

sort prog

by prog: summarize read write math

sort female

by female: summarize read write math

over

graph bar read, over(prog)

graph box write, over(prog)

if

summarize read write math if ses=="high"

summarize read write math if ses=="3"

summarize read write math if ses==3

summarize read if ses==1 | ses==2

summarize read if ses~=3

summarize read if ses < 3

summarize read if female==2 & ses < 3

scatterplot & correlation

scatter read write

correlate read write math science

graph matrix read write math science, half

creating and modifying variables

generate total = read + write

summarize total

replace total = total + math

summarize total

generate honors = .
replace honors = 1 if write >= 60 & write < 100
replace honors = 0 if write >= 0 & write < 60

tabulate honors

generate highses = ses
recode highses 3=1 1 2=0
tabulate highses

entering your own data

Smith       79       84
Jones       87       86
Brown       91       94
Adraktas    80       84


clear

edit

save mydata

You can also enter data using a text editor or word processor. Below is a data file called tdata.raw. It was created using a text editor and saved "plain" ascii text.

-------------------------------tdata.raw-----------------------

"Smith"       79       84
"Jones"       87       86
"Brown"       91       94
"Adraktas"    80       84
"Johnson"     78       83
"James"       86       82
"Scott"       90       93
"Sanders"     79       83
"Henderson"   77       82
"Allen"       85       84
"Murphy"      89       92
"Jackson"     78       82

---------------------------------------------------------------

clear

copy http://www.ats.ucla.edu/stat/stata/notes3/tdata.raw tdata.raw

infile str10 name midterm final using tdata.raw

save tdata

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