introduction to stata - bert milla

INTRODUCTION TO STATA

NORBERTO E. MILLADepartment of StatisticsVisayas State University

Statistical Packages for Social Sciences (SPSS)

Statistical Analysis Software (SAS)

Stata

Minitab

Statgraphics

Systat

R

Python

general-purpose statistical program with uniquefeatures not found in other packages

takes a simpler approach to statistical analyseswith a single program interface.

technical help, updates, and upgrades are possibleonline

manuals/guides (pdf documentatation) comes withStata installation

available on the three (3) major operatingsystems:

Windows, Macintosh, and Unix

comes in four flavors:

Stata/MP, Stata/SE, Stata/IC, and Small Stata

RESULTS window

VARIABLES

window

COMMAND window

PROPERTIES

window

REVIEW

window

Data files: rows (variables) and columns (observations) of information; have the .dta file extension

Do files: contain set of commands which can be executed together; have the .do file extension

(.ado files contain codes of new Stata commands)

Log files: contain a record of all commands issued and the corresponding output in the Results window (except graphs); have the .smcl (default) or .log file extension

Numeric-purely numbers; black in color

String-contains numbers and/or letters; red incolor

Value labels-internally these are numbers but canbe seen as alphabetic characters on screen; bluein color

Numbers are stored as byte, int, long, float (default), or double

byte, int, and long can hold only integers

Go to the File Menu (User-interface) and select the icon

Then browse to your preferred folder.

Click OK.

the easiest way to enter data directly into Stata is thru theData Editor (Edit).

it looks like a spreadsheet with columns as variables androws as observations.

Data>>Data Editor>>Data Editor (Edit)

Or by clicking the Data Editor (Edit) icon

File>>Import>>Excel spreadsheet (*.xls;*.xlsx)

In the dialog box, Browse to the directory where the files is saved, specify the Worksheet, and check Import first row as variable names box. Click OK.

Press Crtl+C to copy

Open Stata Editor (Edit) and press Ctrl+V to paste

Click Variable names in the dialog box.

Open an Excel File

Highlight all cells with data, including column labels (Cntrl+A)

OUTPUT

99% 52 52 Kurtosis 4.091113

95% 43 50 Skewness 1.190063

90% 40 47 Variance 46.75679

75% 33 44

Largest Std. Dev. 6.837894

50% 28 Mean 29.76543

25% 25 22 Sum of Wgt. 81

10% 23 22 Obs 81

5% 22 21

1% 21 21

Percentiles Smallest

Age of teacher

99% 5 5 Kurtosis 2.427626

95% 4 5 Skewness .8231276

90% 4 5 Variance 1.511111

75% 3 4

Largest Std. Dev. 1.229273

50% 2 Mean 2.037037

25% 1 1 Sum of Wgt. 81

10% 1 1 Obs 81

5% 1 1

1% 1 1

Percentiles Smallest

length_teach_english

Total 2.037037 1.229273

Male 2.285714 1.069045

Female 1.985075 1.261223

sex mean sd

OUTPUT

1.691482

40 and up 3.11111 1

1.268028 .9574271

30-39 1.85 2.25

1.017626 1.130388

20-29 1.78947 2.44444

er Female Male

age_teach sex

RECODE of

OUTPUT

Total 2.037037 1.2292726 81

Male 2.2857143 1.069045 14

Female 1.9850746 1.2612228 67

sex Mean Std. Dev. Freq.

Summary of length_teach_english

OUTPUT

Total 1.915493 1.1051371 71

Male 2.3846154 1.0439078 13

Female 1.8103448 1.0995517 58

sex Mean Std. Dev. Freq.

Summary of length_teach_english

Highlight the entire output and right-click.

Select from one of four ways to copy output from Stata to a Word or Excel document

01

02

03

04

05

0

Num

ber

of te

ache

rs

20-29 30-39 40 and up

Age of teachers

02

04

06

0

Pe

rcen

t

20-29 30-39 40 and up

Age of teachers

1.91 1.92

2.90

01

23

Me

an

len

gth

of se

rvic

e

20-29 30-39 40 and up

Age of teachers

Figure 3. Length of sevice of English teachers by age group

05

10

15

20

Fre

que

ncy

20 25 30 35 40 45 50 55 60Age of teachers

12

34

5

Female Male

Len

gth

of se

rvic

e

12

34

5

20 30 40 50age_teacher

length of service Fitted values

Female Male

Married Single Widower

Acock, A. A. (2014). A Gentle Introduction to Stata, 4th Ed. 4905 Lakeway Drive, College Station, Texas 77845: Stata Press

https://stats.idre.ucla.edu/stata/modules/

https://stats.idre.ucla.edu/stata/modules/graph8/intro/introduction-to-graphs-in-stata/