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STATADATAMANAGEMENT
REFERENCEMANUAL
RELEASE18¨A Stata Press Publication
StataCorp LLC
College Station, Texas
¨Copyright
c1985-2023 StataCorp LLC
All rights reserved
Version 18
Published by Stata Press, 4905 Lakeway Drive, College Station, Texas 77845Typeset in T
EXISBN-10: 1-59718-376-8
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StataCorp. 2023.Stata: Release 18. Statistical Software. College Station, TX: StataCorp LLC.Contents
Intro. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Introducti onto data management reference manual 1
Data management
. . . . . . . . . . . . . . . . . . . . . . . . Introduction to data management commands 2 append. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Append datasets 8
assert. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V erifytruth of claim 16
assertnested. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V erifyv ariablesnested 21
bcal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Business calendar file manipulation 25
by. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Repeat Stata command on subsets of the data 31
cd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Change directory 35
cf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Compare tw odatasets 39
changeeol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Con vertend-of-line characters of te xtfile 43
checksum. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Calculate checksum of file 45
clear. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clear memory 48
clonevar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clone e xistingv ariable51
codebook. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Describe data contents 54
collapse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mak edataset of summary statistics 65
compare. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Compare tw ov ariables75
compress. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Compress data in memory 77
contract. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mak edataset of frequencies and percentages 79
copy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cop yfile from disk or URL 83
corr2data. . . . . . . . . . . . . . . . . . . . . . . . . . Create dataset with specified correlation structure 86
count. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Count observ ationssatisfying specified conditions 91
cross. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F orme verypairwise combination of tw odatasets 93
Data types
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Quick reference for data types 95
datasignature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Determine whether data ha vechanged 97
Datetime
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dat eand time v aluesand v ariables105
Datetime business calendars
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Business calendars 123Datetime business calendars creation
. . . . . . . . . . . . . . . . . . . . . . . Business calendars creation 130Datetime conversion
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Con vertingstrings to Stata dates 140Datetime display formats
. . . . . . . . . . . . . . . . . . . . . . . . Displa yformats for dates and times 151Datetime durations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . Obtaining and w orkingwith durations 157Datetime relative dates
. . . . . . . . . . . Obtaining dates and date information from other dates 169Datetime values from other software
. . . . . . . Date and time con versionfrom other softw are177 describe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Describe data in memory or in a file 183
destring . . . . . . . . . . . . . . . . . . Con vertstring v ariablesto numeric v ariablesand vice v ersa191 dir. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Display filenames 200
drawnorm. . . . . . . . . . . . . . . . . . . . . . . . . Dra wsample from multi variatenormal distrib ution203
drop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Drop v ariablesor observ ations208
ds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Compactly list v ariableswith specified properties 213
duplicates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Report, tag, or drop duplicate observ ations219
dyngen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dynamical lygenerate ne wv aluesof v ariables226
edit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bro wseor edit data with Data Editor 230
egen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Extensions to generate 236
encode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Encode string into numeric and vice v ersa258
i ii Contents erase. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Erase a disk file 265
expand. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Duplicate observ ations267
expandcl. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Duplicate clustered observ ations270
export. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ov erviewof e xportingdata from Stata 273
filefilter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Con vertASCII or binary patterns in a file 276
fillin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rectangularize dataset 280
format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Set v ariables"output format 282
fralias. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Alias v ariablesfrom link edframes 296
frames intro. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Introduction to frames 308
frames. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Data frames 320
frame change. . . . . . . . . . . . . . . . . . . . . . . . . . . . Change identity of current (w orking)frame 323
frame copy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mak ea cop yof a frame 325
frame create. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Create a ne wframe 327
frame drop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Drop frames from memory 329
frame prefix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The frame prefix command 331
frame put . . . . . . . . . . . . . . . . . . . . . Cop yselected v ariablesor observ ationsto a ne wframe 333 frame pwf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Display name of current (w orking)frame 336
frame rename. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rename e xistingframe 338
frames describe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Describe frames in memory or in a file 340
frames dir. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Display names of all frames in memory 347
frames reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Drop all frames from memory 349
frames save. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sa vea set of frames on disk 351
frames use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Load a set of frames from disk 356
frget. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cop yv ariablesfrom link edframe 361
frlink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Link frames 368
frunalias. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Change storage type of alias v ariables387
generate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Create or change contents of v ariable389
gsort. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ascending and descending sort 395
hexdump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Display he xadecimalreport on file 399
icd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Introduction to ICD commands 405
icd9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ICD-9-CM diagnosis codes 413
icd9p. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ICD-9-CM procedure codes 424
icd10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ICD-10 diagnosis codes 431
icd10cm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ICD-10-CM diagnosis codes 442
icd10pcs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ICD-10-PCS procedure codes 454
import. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ov erviewof importing data into Stata 463
import dbase. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Import and e xportdBase files 472
import delimited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Import and e xportdelimited te xtdata 475
import excel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Import and e xportExcel files 487
import fred . . . . . . . . . . . . . . . . . . . . . . . . . Import dat afrom Federal Reserv eEconomic Data 494 import haver. . . . . . . . . . . . . . . . . . . . . . . . . . . . Import data from Ha verAnalytics databases 521
import sas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Import SAS files 531
import sasxport5 . . . . . . . . . . . . . . Import and e xportdata in SAS XPOR TV ersion5 format 535 import sasxport8 . . . . . . . . . . . . . . Import and e xportdata in SAS XPOR TV ersion8 format 546 import spss. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Import and e xportSPSS files 549
infile (fixed format) . . . . . . . . . . . . . . . . . . Import te xtdata in fix edformat with a dictionary 554 infile (free format). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Import unformatted te xtdata 573
infix (fixed format). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Import te xtdata in fix edformat 583
input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enter data from k eyboard591
Contents iii
insobs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Add or insert observ ations599
inspect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Display simple summary of data" sattrib utes601
ipolate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Linearly interpolate (e xtrapolate)v alues605
isid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check for unique identifiers 608
jdbc. . . . . . . . . . . . . . . . . . . . . . Load, write, or vie wdata from a database with a Ja vaAPI 611
joinby. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F ormall pairwise combinations within groups 623
label. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manipulate labels 628
label language . . . . . . . . . . . . . . . . . . . Labels for v ariablesand v aluesin multiple languages 638 labelbook. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Label utilities 645
list. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . List v aluesof v ariables656
lookfor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Search for str ingin v ariablenames and labels 666
memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Memory management 668
merge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mer gedatasets 674
Missing values
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Quick reference for missing v alues698
mkdir. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Create directory 699
mvencode . . . . . . . . . . . . . . . . . . . . Change missing v aluesto numeric v aluesand vice v ersa701 notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Place notes in data 705
obs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Increase the number of observ ationsin a dataset 711
odbc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Load, write, or vie wdata from ODBC sources 713
order. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reorder v ariablesin dataset 727
outfile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Export dataset in te xtformat 731
pctile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Create v ariablecontaining percentiles 738
putmata. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Put Stata v ariablesinto Mata and vice v ersa750
range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Generate numerical range 762
recast. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Change storage type of v ariable765
recode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Recode cate goricalv ariables768
rename. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rename v ariable777
rename group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rename groups of v ariables779
reshape. . . . . . . . . . . . . . . . . . . . . . . . . . Con vertdata from wide to long form and vice v ersa790
rmdir. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remo vedirectory 808
sample. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dra wrandom sample 810
save. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sa veStata dataset 815
separate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Create separate v ariables821
shell. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T emporarilyin vokeoperating system 825
snapshot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sa veand restore data snapshots 831
sort. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sort data 834
split. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Split string v ariablesinto parts 843
splitsample. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Split data into random samples 848
stack. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stack data 857
statsby. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Collect statistics for a command across a by list 863
sysuse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Use shipped dataset 872
type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Display contents of a file 875
unicode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unicode utilities 878
unicode collator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Language-specific Unicode collators 879
unicode convertfile . . . . . . . . . . . . . . . . . . . . . . Lo w-levelfile con versionbetween encodings 881 iv Contents unicode encoding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unicode encoding utilities 884
unicode locale. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unicode locale utilities 886
unicode translate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T ranslatefiles to Unicode 889
use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Load Stata dataset 904
varmanage. . . . . . . . . . . . . . . . . . . . . . Manage v ariablelabels, formats, and other properties 908
vl. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manage v ariablelists 909
vl create. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Create and modify user -definedv ariablelists 926
vl drop. . . . . . . . . . . . . . . . . . . . . . . . . . . . Drop v ariablelists or v ariablesfrom v ariablelists 930
vl list. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . List contents of v ariablelists 933
vl rebuild. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reb uildv ariablelists 940
vl set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Set system-defined v ariablelists 944
webuse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Use dataset from Stata website 949
xpose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interchange observ ationsand v ariables952
zipfile . . . . . . . . . . . . . Compress and uncompress files and directories in zip archi veformat 955Glossary
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 958
Subject and author index
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 963
Cross-referencing the documentation
When reading this manual, you will find references to other Stata manuals, for example, [U] 27 Overview of Stata estimation commands;[ R]regress; and[ D]reshape. The first ex- ample is a reference to chapter 27,Overview of Stata estimation commands, in theUser"s Guide; the second is a reference to theregressentry in theBase Reference Manual; and the third is a reference to thereshapeentry in theData Management Reference Manual. All the manuals in the Stata Documentation have a shorthand notation: [GSM]Getting Started with Stata for Mac [GSU]Getting Started with Stata for Unix [GSW]Getting Started with Stata for Windows [U]Stata User"s Guide [R]Stata Base Reference Manual [ADAPT]Stata Adaptive Designs: Group Sequential Trials Reference Manual [BAYES]Stata Bayesian Analysis Reference Manual [BMA]Stata Bayesian Model Averaging Reference Manual [CAUSAL]Stata Causal Inference and Treatment-Effects Estimation Reference Manual [CM]Stata Choice Models Reference Manual [D]Stata Data Management Reference Manual [DSGE]Stata Dynamic Stochastic General Equilibrium Models Reference Manual [ERM]Stata Extended Regression Models Reference Manual [FMM]Stata Finite Mixture Models Reference Manual [FN]Stata Functions Reference Manual [G]Stata Graphics Reference Manual [IRT]Stata Item Response Theory Reference Manual [LASSO]Stata Lasso Reference Manual [XT]Stata Longitudinal-Data/Panel-Data Reference Manual [META]Stata Meta-Analysis Reference Manual [ME]Stata Multilevel Mixed-Effects Reference Manual [MI]Stata Multiple-Imputation Reference Manual [MV]Stata Multivariate Statistics Reference Manual [PSS]Stata Power, Precision, and Sample-Size Reference Manual [P]Stata Programming Reference Manualquotesdbs_dbs23.pdfusesText_29[PDF] saio creteil numero
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