Getting Started in Data Analysis using Stata
Getting Started in Data Analysis using Stata
(v. 6.0)
Oscar Torres-Reyna
otorres@princeton.edu
December 2007
Stata Tutorial Topics
What is Stata? Stata screen and general description First steps:
Setting the working directory (pwd and cd ....) Log file (log using ...) Memory allocation (set mem ...) Do-files (doedit) Opening/saving a Stata datafile Quick way of finding variables Subsetting (using conditional "if") Stata color coding system From SPSS/SAS to Stata Example of a dataset in Excel From Excel to Stata (copy-and-paste, *.csv) Describe and summarize Rename Variable labels Adding value labels Creating new variables (generate) Creating new variables from other variables (generate) Recoding variables (recode) Recoding variables using egen Changing values (replace) Indexing (using _n and _N) Creating ids and ids by categories Lags and forward values Countdown and specific values Sorting (ascending and descending order) Deleting variables (drop) Dropping cases (drop if) Extracting characters from regular expressions
Merge Append Merging fuzzy text (reclink) Frequently used Stata commands Exploring data:
Frequencies (tab, table) Crosstabulations (with test for associations) Descriptive statistics (tabstat) Examples of frequencies and crosstabulations Three way crosstabs Three way crosstabs (with average of a fourth variable) Creating dummies Graphs Scatterplot Histograms Catplot (for categorical data) Bars (graphing mean values) Data preparation/descriptive statistics(open a different file): Linear Regression (open a different file): Panel data (fixed/random effects) (open a different file): Multilevel Analysis (open a different file): Time Series (open a different file): Useful sites (links only) Is my model OK? I can't read the output of my model!!! Topics in Statistics Recommended books
PU/DSS/OTR
What is Stata?
? It is a multi-purpose statistical package to help you explore, summarize and analyze datasets. It is widely used in social science research. ? A dataset is a collection of several pieces of information called variables (usually arranged by columns). A variable can have one or several values (information for
one or several cases).
Features
Learning curve
SPSS Gradual
SAS Pretty steep
Stata Gradual
JMP (SAS)
R
Gradual Pretty steep
Python (Pandas)
Steep
User interface
Point-andclick
Programming/ Programming point-and-
click
Point-andclick
Programming Programming
Data manipulation
Strong
Data analysis Very strong
Graphics
Good
Very strong Very strong
Good
Strong Very strong Very good
Strong Strong Very good
Very strong Very strong
Excellent
Strong Strong Good
Cost
Expensive (perpetual, cost only with new version).
Expensive (yearly renewal)
Affordable (perpetual, cost only with new version).
Expensive (yearly renewal)
Open source Open source
(free)
(free)
Student disc.
Free student version, 2014
Student disc.
Student disc.
Released
1968
1972
1985
1989
1995
2008
PU/DSS/OTR
Stata's previous screens
Stata 10 and older Stata 11
Stata 12/13+ screen
Variables in dataset here
History of commands, this window
Output here ?????
Files will be saved here
Write commands here
Property of each variable here
PU/DSS/OTR
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