Subject index. ASCII data, reading comma-separated fixed column multiple lines per observation

Transcription

1 Subject index Symbols %fmt * abbreviation character * comment indicator combining strings abbreviation character ,.a,.b,...,.z missing values , /* */ comment indicator // comment indicator /// continuation comment indicator ? abbreviation character ## interaction ~ abbreviation character , 2. prefix A abbreviating variable lists accessing results of commands...see saved results ado-files aggregate statistics, making dataset of all, abbreviation alphabetizing variables anycount(), egen function anymatch(), egen function append command appending datasets problems ASCII data, reading comma-separated fixed column multiple lines per observation ASCII data, reading, continued space-separated tab-separated saving comma-separated space-separated tab-separated assert command autocode() function automating data checking B backups, admonishments to perform remote storage of baseline group, selecting browse command...73 by-groups , , change from last value computations across computations within filling in missing values first observation within last observation within previous value , repeating commands across singletons within subsequent value by varlist: prefix , , , bysort varlist: prefix , , , bysort versus tsset byte data type

2 380 Subject index C categorical variables , by categorical variables, checking by continuous variables, checking checking cd centering variables cf command changing directories...10 changing shape of data.. see reshaping datasets chasing your own tail..see tail, chasing your own checking data, automating categorical by categorical variables categorical by continuous variables categorical variables continuous by continuous variables continuous variables double data entry cleaning data...see correcting data clear command clear option, with use command clock() function codebook command coding missing values collapse command collapsing datasets combining datasets appending crossing many-to-many merge merge options merging multiple one-to-many merge one-to-one merge combining datasets, continued problems appending problems merging update merge combining do-files commands, accessing results..see saved results repeating across by-groups repeating across variables repeating automatically repeating over anything repeating over numbers commas, reading data separated by saving data separated by commenting datasets variables comments compress command computations across observations , , variables , continuation comment, /// continuous variables by continuous variables, checking checking converting variables numeric to string string to numeric correcting data double data entry count(), egen function counting words counts, making dataset of creating dataset of estimation results creating variables cross command crossing datasets

3 Subject index 381.csv files, reading saving D D. prefix (difference) data checking... see checking data cleaning... see correcting data correcting... see correcting data entry , types data analysis project Data Editor dataset labels dataset of estimation results datasets, appending changing the shape of...see reshaping datasets collapsing.. see collapsing datasets commenting crossing describing downloading, for this book example datasets from Stata labeling large long... see long datasets many-to-many merge merge options merging multiple multilevel.. see multilevel datasets one-to-many merge one-to-one merge problems appending problems merging reading Stata reshaping.. see reshaping datasets saving Stata update merge wide... see wide datasets date variables date() function...138, date-and-time variables dates...see date variables day() function , decode command deleting observations variables delimited files, reading...see ASCII data, reading saving... see ASCII data, saving describe command... 39, describing datasets descriptive statistics, making dataset of destring command dichotomizing variables dictionary file with infile command with infix command diff(), egen function digits, controlling number displayed directories, changing display formats documenting do-files project dofc() function do-files, automating data checking checking combining commenting documenting introduction to master skeleton version command double data entry double data type dow() function...141, 150 downloading datasets for this book user-written programs

4 382 Subject index doy() function...141, 150 drop command dropping observations variables dummy variables duplicate observations, dropping...48, identifying... 48, duplicates command E e(), results stored in edit command editing data egen command , , encode command entering data ereturn list command errors in data, correcting... see correcting data finding...see checking data estimation results, making dataset of example datasets for this book from Stata exporting data, SAS XPORT files exporting raw data...see ASCII data, saving expressions, numeric string F F. prefix (forward) factor variables FAQs FDA (SAS XPORT) files, reading saving fdasave command fdause command filling in missing values, within by-groups findit command first observation within by-groups fixed-column data, reading multiple lines per observation float data type foreach command format command formatted raw data, reading...see ASCII data, reading saving... see ASCII data, saving frequencies, making dataset of frequently asked questions... see FAQs functions numeric , string fvset command G generate command global command global macros... see macros H header variables hh() function I i. prefix identifiable information if exp modifier SAS XPORT files importing raw data... see ASCII data, reading in range modifier indicator variables infile command with dictionary infix command with dictionary %infmt

5 Subject index 383 inlist() function inputting data interactively inputting raw data...see ASCII data, reading inrange() function insheet command int() function...120, 362 int data type interaction terms intermediate files, pruning irecode() function isid command J joinby command joining datasets K keep command keeping observations variables L L. prefix (lag) label define command dir command...92 language command , list command save command values command variable command labelbook command languages, multiple large datasets last observation within by-groups leading spaces, removing length() function list command listing observations value labels listserver for Stata ln() function loading saved data local command local macros...see macros.log files log files, introduction to log using command log10() function logical expressions and missing values long datasets, advantages compared with multilevel datasets compared with wide disadvantages reshaping to wide problems long data type lookfor command...82 looping across variables over anything over numbers lower() function ltrim() function M macros, expressions with functions with introducing local versus global manipulating quotes many-to-many merge master do-file mathematical functions max(), egen function , maximums, making dataset of mdy() function , mdyhms() function

6 384 Subject index mean(), egen function , means, making dataset of memory, setting , 288 merge command merge variable merging datasets one-to-many crossing many-to-many multiple one-to-many one-to-one options problems update min(), egen function , minimums, making dataset of missing values , in logical expressions missing() function , mm() function modifying variables month() function...141, multilevel datasets multiple datasets, merging multiple languages multiple lines per observation, reading mvdecode command mvencode command N N (number of observations) , n (observation number) note command...65, notes command , 82 83, numbers, repeating commands over numeric functions , variable to string numeric, continued variables numlabel command O observations, computations across , computing differences between deleting dropping dropping duplicates identifying duplicates keeping listing previous value randomly sampling running means across running proportions across running sums across subsequent value omitted group, selecting one-to-many merge one-to-one merge online resources order command , 164, ordering variables , out-of-range values, correcting... see correcting data finding...see checking data outfile command outputting raw data...see ASCII data, saving outsheet command P program drop command list command programming Stata programs, user-written proper() function...122

7 Subject index 385 Q quarter() function...141, 150 quotes to expand macros R r(), results stored in random-number functions , randomly sampling observations raw data, reading...see ASCII data, reading saving... see ASCII data, saving rchi2() function reading files common errors Stata datasets types of files reading raw data...see ASCII data, reading reading SAS XPORT files reading Stata datasets within SAS recode command recoding variables regression coefficients, making dataset of rename command renpfix command reordering variables , reorganizing datasets... see reshaping datasets repeating commands across by-groups across variables over anything over numbers replace command , reshape long command wide command reshaping datasets, long to wide problems reshaping datasets, continued wide to long problems return list command rnormal() function round() function , 362 routines, benefits of rowmax(), egen function rowmean(), egen function , 373 rowmin(), egen function rowmiss(), egen function...152, rownonmiss(), egen function , R-squared, computing change in runiform() function , running means, across observations running proportions, across observations running sums, across observations S SAS XPORT files, reading saving save command saved results creating dataset of saveold command...16 saving files raw data... see ASCII data, saving SAS XPORT files Stata datasets within SAS sd(), egen function set memory command , 288 more off command type command

8 386 Subject index setting memory , 288 Sheldon, J singletons within by-groups smcl files spaces, reading data separated by saving data separated by spreadsheets, transferring from Stata into Stata sqrt() function...120, ss() function SSC archive ssc command standard deviations, making dataset of Stat/Transfer...44 Stata datasets, reading saving Stata Journal Stata macros...see macros Stata programs, writing Stata syntax Stata Technical Bulletin Stata web site Stata, updating...3 Statalist statsby prefix command storage types str# data type string functions string variable to numeric string variables string() function subscripting observations substr() function sum() function summarize command sums, making dataset of syntax of Stata commands sysuse command T tabs, reading data separated by saving data separated by tabulate command tail, chasing your own...see chasing your own tail %tc format %tc format tc() pseudofunction %td format , td() pseudofunction tostring command total(), egen function transferring data from Stata into Stata translate command tsset command tsset versus bysort two-digit years U UCLA ATS web site update command... 3 update merges updating Stata...3 upper() function use command user-written programs, finding and downloading V validating data... see checking data value labels listing multiple languages problems variable labels lists variables, 1., 2. prefix alphabetizing categorical centering

9 Subject index 387 variables, continued checking... see checking data commenting computations across , converting numeric to string converting string to numeric correcting... see correcting data creating date date and time deleting dichotomizing display formats dropping dummy factor i. prefix indicator keeping labeling modifying recoding reordering , repeating commands across types of Variables Manager varlist version command , 288 word() function wordcount() function Y year() function...141, years, two digit W web resources web site for this book webuse command week() function , 150 wide datasets, advantages compared with long compared with multilevel datasets disadvantages reshaping to long problems