Introduction to Stata 8 - (GRIPS

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Example 3. Analyse Stata data // winedes.do Descriptive analysis of the wine data 14.5.2001 use c:\dokumenter\wines\wine.dta describe codebook summarize tab1 type rating tabulate type rating , chi2 exact oneway price rating , tabulate Note that in example 1 and 2 the structure was: 1. Read data (infix, use) 2. Calculation and documentation commands 3. Save data (save) In these examples a new generation of the data was created; changes were documented with a do-file with a gen. prefix. In example 3 the structure was: 1. Read data (use) 2. Analysis commands No new data generation was created, and the gen. prefix does not belong to such do-files. Example 4. Elaborate profile.do // c:\ado\personal\profile.do executes automatically when opening Stata. // Write session start time in time.txt. set obs 1 gen time="******* Session started: `c(current_date)' `c(current_time)'" outfile time using c:\tmp\time.txt, noquote replace clear // Copy session start time to the cmdlog (cmdlog.txt) and open it. // ! means that a DOS command follows. ! copy /b c:\tmp\cmdlog.txt + c:\tmp\time.txt c:\tmp\cmdlog.txt /y cmdlog using c:\tmp\cmdlog.txt , append // Open the log (stata.log). set logtype text log using c:\tmp\stata.log , replace Compared to the profile.do suggested in section 1.2, this version adds a time stamp to the command log file (cmdlog.txt). This means better possibilities to reconstruct previous work. 66
Appendix 1 Purchasing Stata and manuals To most users the following manuals will suffice: [GSW] Getting Started manual [U] User's Guide [R] Base Reference Manual (four volumes) but I wouldn't recommend less to anybody. This booklet does not intend to replace the manuals, but hopefully it can serve as a guide. If you work with epidemiological studies and survival analysis, you also need: [ST] Survival Analysis and Epidemiological Tables If you want to decide exactly how your graphs should look, you need: [G] Graphics manual However, the Graphics manual is a difficult companion; it took quite some time for me to understand where to look for what. If you want to write your own programs (ado-files), the User's Guide helps you some of the way, but you may need: [P] Programming manual The Scandinavian sales agent for Stata and StatTransfer is Metrika (www.metrika.se). Students and employees at University of Aarhus and Aarhus University Hospital can purchase Stata at a special discount rate. Other educational institutions may have similar arrangements. Various local information concerning Stata and other software may be found at: www.biostat.au.dk/teaching/software. 67
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Introduction to Stata 8 Svend Juul
Page 3 and 4:
Preface Stata is a software package
Page 5 and 6:
1. Installing, customizing and upda
Page 7 and 8:
2. Windows in Stata [GSW] 2 The org
Page 9 and 10:
3. Suggested mode of operation The
Page 11 and 12:
4. Getting help [GSW] 4, 19, 20; [U
Page 13 and 14:
6. Variables A Stata data set is re
Page 15 and 16:
7. Command syntax [U] 14.1 Stata is
Page 17 and 18: y and bysort prefix [U] 14.5 Makes
Page 19 and 20: Reading ASCII data [U] 24 Reading t
Page 21 and 22: See label definitions See the value
Page 23 and 24: generate; replace Generate a new va
Page 25 and 26: 10.2. Selections Selecting observat
Page 27 and 28: 10.6. Combining files [U] 25 Append
Page 29 and 30: 11. Description and analysis This s
Page 31 and 32: tabi [R] tabulate tabi is an 'immed
Page 33 and 34: ttest [R] ttest T-test for comparis
Page 35 and 36: 12.2. Logistic regression logistic
Page 37 and 38: . summarize Variable | Obs Mean Std
Page 39 and 40: poisson [R] poisson The stsplit.can
Page 41 and 42: 14.2. The anatomy of graphs Figure
Page 43 and 44: You may define maximum and minimum
Page 45 and 46: 14.7. Examples On the following pag
Page 47 and 48: twoway scatter 40 Mileage (mpg) 30
Page 49 and 50: twoway connected; twoway rcap 100 8
Page 51 and 52: twoway dropline 20 Patient number 1
Page 53 and 54: graph matrix 10 20 30 40 graph matr
Page 55 and 56: Submitting graphs to journals etc.
Page 57 and 58: 15.2. String variables [U] 15.4; [U
Page 59 and 60: 15.3. Dates. Danish CPR numbers Dat
Page 61 and 62: 15.4. Random samples, simulations R
Page 63 and 64: 15.6. Sample size and study power s
Page 65 and 66: 15.8. Exchange of data with other p
Page 67: 16. Do-file examples Here follow sh
Page 71 and 72: Variable names can have up to 8 cha
Page 73 and 74: Index A ado-files .................
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Introduction to Stata 8 - (GRIPS

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