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1 Department of Mathematics and Statistics, University of Vaasa, Finland Texas A&M University, May June, 2013 As of May 17, 2013
2 Part I Stata Introduction
3 1 Stata Introduction Interface Commands Command syntax Immediate commands Stata help Loading data Stata working tips: directories Stata working tips: log file Stata working tips: do-file Stata resources
4 Interface Review window: Past comments Results window: Displays results Variables window: Displays variables and their labels Properties window: Displays data properties Command window: Commands are typed here
5 Commands Commands typed in the command windows are exercised immediately after hitting the return key: E.g. typing: display 5*2 produces in the Results window. display 2*5 10 Note: Stata commands are case sensitive!. Display unrecognized command: r(199); Display
6 Commands scatter r1 rm, by(event) lfit r1 rm estimation period event period Market return Merril Lynch & Co Inc Fitted values Graphs by Event/Estimation period
7 Command syntax Generally the commands are of the form [prefix:] command [if] [in] [weight] [, options] Brackets indicate optional parts. summarize r1 r2 if event == 1. summarize r1 r2 if event == 1 Variable Obs Mean Std. Dev. Min Max r r
8 Command syntax. summarize r1 if event == 1, detail Merrill Lynch & Co Inc Percentiles Smallest 1% % % Obs 62 25% Sum of Wgt % 0 Mean Largest Std. Dev % % Variance % Skewness % Kurtosis
9 Immediate commands Immediate commands turn Stata into a useful calculator. They do not affect data in memory. Usually have also a nonimmediate (computed from data) counterparts. End in the letter i (the converse is not true). Confidence interval of Merrill Lynch & Co Inc daily returns.. ci r1 Variable Obs Mean Std. Err. [95% Conf. Interval] r
10 Immediate commands Suppose that in a simulation study the empirical rejection rate at 0.05 level of the null hypothesis by a new test statistic was in 1, 000 independent replications. Size problems with the new test? Immediate command for variable distributed as binomial cii #obs #succ [, ciib_options] cii Binomial Exact -- Variable Obs Mean Std. Err. [95% Conf. Interval]
11 Immediate commands Alternatively, using binomial test: Immediate form of binomial probability test bitesti #N #succ #p [, detail]. bitesti N Observed k Expected k Assumed p Observed p Pr(k >= 71) = (one-sided test) Pr(k <= 71) = (one-sided test) Pr(k <= 30 or k >= 71) = (two-sided test)
12 Immediate commands For further information, see Stata help help immediate commands
13 Stata help To get help type: help command name For example, help ttest opens a new window, called viewer window See also the search command. Type: help search to learn more. You can also use the help menu.
14 Loading data Data can be loaded as a Stata file (.dta), various forms of text files and from various applications like Excel (Stata version 12). See, Menu: File > Import Files can be also loaded from the internet. Stata web-site has several example data sets. For example use opens the file with comments. use (Source: Yahoo! Finance)
15 Loading data. describe Contains data from obs: 494 Source: Yahoo! Finance vars: 5 12 Jan :32 size: 9, storage display value variable name type format label variable label date float %td Date irx float %9.0g Annual return / 365 (percent) ibm float %9.0g Daily return (percent) spx float %9.0g Daily return (percent) t float %9.0g Sorted by: date
16 Loading data Listing 5 first observations. list in 1/ date irx ibm spx t jan jan jan jan jan
17 Stata working tips: directories It is a good idea to organize the project to directories. For example: Documents, Data, Results, Stata, etc. Directories and files can be managed from Stata with command: pwd to see the current directory mkdir to create a new directory dir or ls to list the names of the files cd to change a directory type to list file contents erase or rm to delete a file
18 Stata working tips: log file Output goes to the Results window. To keep a permanent record you can open a log file: log using filename, text replace The options text makes the file as a text file and replace specifies that the file will be overwritten if it exists.
19 Stata working tips: do-file Stata commands can be written into a text file, called do file. Stata has a build-in do-file Editor. New do-file can be opened by command doedit or Ctrl-9 (version 12, Ctrl-8 in earlier versions) or by clicking New Do-file Editor in the task bar or by selecting menu Window > Do-file Editor > New Do-file Editor. Crtl-d to run the whole do-file or mark by paint specific lines to run (Menu: Tools > Execute).
20 Stata working tips: do-file In a do-file everything followed // to the end of file is a comment (Note the exception, url Everything between /* */ is comment. * in the first column indicates a comment line /// indicates line continuation. Text after /// is ignored, i.e., is comment
21 Stata working tips: do-file Sample do-file
22 Stata resources Menu: Home page: Net course: Faq: Tutorials Manuals (version 11 and above): Help > PDF Documentation User written additions to Stata can be found by Stata prompt net from
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