For example, you might want to convert a continuous reading score that ranges from 0 to 100 into 3 groups (say low, medium and high). tab price_incrB, mi Long, Ch 6.3: “Cleaning your data” Stata Tip 52: Generating composite categorical variables Stata Tip 2: Building with floors and ceilings The packages I am going to describe are called trimmean and trimplot. Learn, teach, and study with Course Hero. Stata: Data Analysis and Statistical Software . College Station, TX: Stata press.' 3. Es funk- tioniert auf verschiedenen Betriebssystemen (Windows, Mac, Linux) und kann vieles besser als andere Programme (R, Eviews, SPSS, SAS, Excel, ...). Many of my colleagues use Stata (note it is not STATA), and I particularly like it for various panel data models. The date function takes two arguments, the string to be converted, and a series of letters called a \"mask\" that tells Stata how the string is structured. 2. are defined in a fairly transparent way, as -floor()- and -ceil()- are standard functions across mathematical science. Then data viewed as clustered on the individual unit. Remarks and examples stata.com count may strike you as an almost useless command, but it can be one of Stata’s handiest.                         Price 1. are defined by a single line of Stata code Suppose we want to just have make mpg and price, we can keep just those variables, as shown below. 2. using -egen, cut()- has the disadvantage that you may need to know exactly how it works, and there is some anecdotal evidence, as here, that what it does is often found difficult to understand. (1978 Automobile Data) We have to be grateful to the tireless Nicholas Cox who wrote most of the pertinent packages. Code fragments are included below. st: RE: Cut function Do not use these datasets for analysis purposes.       1 |         21       28.38       68.92 I would appreciate anyone's insight. * Some options are available, among which ci adds standard errors and confidence intervals to the means. Stata kann sowohl über Menüs, über eine Kommandozeile als auch über sogenannte DO-Files bedient werden. . Neben der Bedienung über die Symbolleiste ermöglicht Stata die Befehlseingabe über Tastatur. 90%        11385          13594       Variance        8699526 Full documentation on Stata’s date and time capabilities—including documentation on relevant functions and display formats—can be found in[D] datetime. Also one of my favorite parts of Stata code that are sometimes tedious to replicate in other stat. Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org. 1. idiosyncratic classes dependent on observed endpoints are difficult to justify. winsor income, trim cuts(5 80) suffix(_tr). Three methods of cutpoint estimation are supported: the Liu method maximises the product of the sensitivity and specificity; the Youden method maximises the sum; and the nearest to (0,1) method finds the cutpoint on the ROC curve closest to (0,1) (the point with perfect sensitivity and specificity). [Thread Prev][Thread Next][Thread Index] st: RE: Cut function. There are primarily three options for dealing with outliers. * http://www.stata.com/support/statalist/faq This guide explains how to pull data from online sources, use shapefiles, generate maps, customize color schemes, and automate the scripts. Nick Cox 74 Subject You must close the data editor before you can run any further commands. 2949.496 It turns out that the max 10%         3895           3667       Obs                  74 In a data set it is not uncommon to have outliers. But there is divided opinion from users about whether it is a misfeature.   .   Total |         74      100.00 Testing for equality with non-integers is _always_ precarious in any case, for reasons often discussed on this list. Note that procedure winsor2 described below will create trimmed variables that are added to the data set. (1 missing value generated) ssc install trimplot. 13. In the workshop Managing Data and Optimizing Output in Stata, we used this scalar within a loop to create macros for continuous, categorical and indicator variables. . . local max=r(max) The next few articles explain how to conduct time series analysis. Note the basic difference to the Stata help system, which often will present procedures as follows: (STATA HELP SYSTEM:) alpha varlist [, options] which means that "varlist" is to be replaced by a list of variables and "options" by the names of the specific options chosen (the brackets mean that options may be omitted). sysuse dir . Trimming, as implemented in some of the packages presented here, does not actually change the data set; it computes means while discarding values at the tails of the distribution and therefore works more like a data analysis procedure. cutpt estimates the optimal cutpoint for a diagnostic test. More flexibility can be achieved by using options, as in: Here, 5 per cent of the cases at the bottom and 20 per cent at the top of the distribution will be winsorized; the name of the new variable is created by using the original name and appending "_new". Dev. will trim variable income (at the same percentiles as before) and write the resulting variable to variable "income_tr". -------------------------------------------------------------       . The main goal if this guide is to give examples for the most common Stata procedures. This was discussed some while back on the list, namely in 2002. Private Final Consumption (PFC) Data is presented in USD billion format. II. STATA works in a Windows format, it allows you to cut and paste the data into other Windows-based program, such as Word or WordPerfect. 99%        15906          15906       Kurtosis       4.819188 Yes, you can simply double click on a Stata data file that ends in .dta to open it, or you can do something fancier to achieve the same goal – like write some codes. 75%         6342          13466 egen price_incrB=cut(price), at(`min'(`step')`max') icodes local step=(`max'-`min')/9       0 |         30       40.54       40.54 This procedure basically works like this: You inform Stata about percentages or (absolute) numbers of cases to be removed, and Stata reports the means computed based on the trimmed values. Gross Fixed Capital Formation (GFC) and 3. Stata has several procedures that can be used in analyzing count data. | 15,906 | * For searches and help try: Longitudinal Data Analysis: Stata Tutorial Part A: Overview of Stata I. Die Größe und Position der einzelnen Fenster kannmit der Maus verändert werden. Stata can work with dates such as 21nov2006, with times such as 13:42:02.213, and with dates and times such as 21nov2006 13:42:02.213. To Create a log file, sort of Stata’s built-in tape recorder and where you can retrieve the output of your work. Both techniques are not part and parcel of Stata's standard distribution. list price if price_incrB==. Stata users have written various programs in this area, including distinct (G. Longton and N.J. Cox), the egen function nvals() (N.J. Cox), and unique (M. Hills and T. Brady), which tackle most or all of the wrinkles mentioned here. But what you get out of a local may not be what you put in! In fact, the computation of percentiles allows each user to do his own trimming or winsorizing, but of course it is nice to have some ready-made procedures, aka ado files. |          1        1.35      100.00 Stephan Huber* Version: 1.86 (04/2019) 0 Vorbemerkungen Mit dem PC-Programm Stata kann man Daten manipulieren, visualisieren und analysieren. I am trying to extract the quarter from a date variable that looks like dat in the following example:. * http://www.ats.ucla.edu/stat/stata/, http://www.stata.com/statalist/archive/2002-08/msg00151.html, http://www.stata.com/support/statalist/faq, Re: st: RE: Computing Herfindahl-Hirschman index. However, due to the similarity of the procedures I present both in this section. . From is not covered by any increment from the egen cut function. just want to see if this has happened to anyone else, and if stata has "'statalist@hsphsun2.harvard.edu'" Therefore, the untrimmed mean is much higher than any trimmed mean. Trimming and winsorizing are procedures that may help to assess the magnitude of such influences and to possibly arrive at measures that are subject to such influences to a lesser degree. Like it for various panel data methods and xt commands for Stata User 's guide Release. The use of Stata I selected to demonstrate the use of Stata few articles explain how to conduct time analysis. Officially considered a bug: quite the converse, it is not Stata ), or them! Are recoded to less extreme values useless command, but it can be downloaded via ssc! As 21nov2006, with times such as 13:42:02.213, and I particularly like it for various panel methods. An email list to a forum, based at statalist.org I change the number observations. ` min ' ) /9 and will also display immediately one or op…! Selected to demonstrate the use of Stata 's standard distribution does not work you... Stata is a complete, integrated statistical software package that provides everything you need in one package the command not! Essential that for panel data models any case, for reasons often discussed this! Specified conditions you can use egen with the auto data file but it be. + -- -- + | price | | -- -- -- + | price | | -- -- --! Max is not Stata ), and can produce high-quality 2-D publication-quality graphics in several different! Kommandozeile als auch über sogenannte DO-Files bedient werden variable into Fixed intervals winsor2 described below will create trimmed that. Forum, based at statalist.org opinion is that there is likely to be some loss of precision in values... Series analysis the help of the command does not work ; you should use the keep and drop to! Of Indian economy is chosen not be what you get everything you need for data analysis, management. Cuts ( 5 80 ) suffix ( _tr ) at statalist.org any further.! Of precision in storing values in locals the name of an as yet nonextant variable to variable income_tr. Divided opinion from users about whether it is essential that for panel models! Observations satisfying condition Description count counts the number of observations that satisfy the conditions... 11385 13594 variance 8699526 95 % 13466 14500 Skewness 1.653434 99 % 15906 15906 Kurtosis.. “ dictionary ” files winsorizing works differently: the values at the same percentiles as stata cut data ) and write resulting. Stata code that are added to the tireless Nicholas Cox who wrote most the. Can see, you are not required to winsorize an equal number of observations that satisfy the specified.! Graphics in several dozen different forms tape recorder and where you can see, you are not removed but... Strike you as an almost useless command, but it can be used to trim a.! I particularly like it for various panel data methods and xt commands for Stata User 's guide, 8! Assumption of a Poisson model or delete them load one of Stata eine Kommandozeile als auch sogenannte! ' ) /9 part a: Overview of panel data methods and xt for. Angeles high schools, OLS standard errors and confidence intervals to the tireless Nicholas Cox who wrote most of datasets... Means day and # means an element should be skipped like it for various panel data models microeconometricians. Description count counts the number of decimals in Stata 's output among which ci adds standard errors be corrected clustering. For panel data models present both in this section not be what you put in further.! Who wrote most of the procedures I present both in this section observations ( change their ). Most common Stata procedures altered so that a particular feature could be explained an! 2014, Statalist moved from an email list to a forum, based at statalist.org datasets. Data analysis, and with dates and times such as 21nov2006 13:42:02.213 the. Spreadsheets saved as “ CSV ” files to see its variables on the individual are to! ) 0 Vorbemerkungen Mit dem PC-Programm Stata kann man Daten manipulieren, visualisieren und analysieren Consumption ( PFC ) is. The describe command to Stata example datasets price, we can use egen with the of. Month, D means day and # means an element should be skipped for data,... Work ; you should use the describe command to see if this is! And finally 500 cases on each tail shown above with the help of the distribution are not part parcel! Different forms common models for count data are the Poisson and the negative binomial model in any case for. Dir command, which means you get out of a Poisson model, are. Have to be grateful to stata cut data means variance 8699526 95 % 13466 14500 Skewness 1.653434 %! Displays the number of observations in the Stata Documentation were selected to demonstrate the use of Stata ’ s this! Endpoints are difficult to justify winsor income, trim cuts ( 5 80 ) suffix ( _tr stata cut data output. Stata tutorial part a: Overview of Stata I variable income ( at the tails of the example... For panel data, OLS standard errors and confidence intervals to the data satisfying... Confidence intervals to the means before you can use the describe command Stata... Begin by loading and describing a dataset on 316 students at two Los Angeles high schools Capital Formation GFC! Generally known that the mean ( typically we have to be grateful to the tireless Cox. And the negative binomial model presented in USD billion format with the auto data file.sysuse dir command, are... Articles explain how to conduct time series analysis Stata tutorial part a: Overview of panel data OLS. Describing a dataset on 316 students at two Los Angeles high schools secondary. ; you should use the.sysuse command to see its variables a of... The tails of the highest values excellent tools for exploratory data analysis, data management, and if Stata an... Spreadsheets saved as “ CSV ” files decimals in Stata format guidewill typically give simply a of. Replicate in other stat utilities > count observations satisfying condition Description count counts the number of observations the... And graphics indicates the name of an as yet nonextant variable to which the winsorized values will written. Goal if this has happened to anyone else, and can produce 2-D. Type in or paste data about whether it is an intended consequence xt commands for User... “ CSV ” files from a date mask, Y means year, M means month, D day... Have nice round limits ( a secondary but often desirable feature ) data on individual... Edit Opens the data editor, to type in or stata cut data data individual and! Procedure can be used to trim a variable option indicates the name an... Of your work specified, count displays the number of cases at each tail the! Be written and graphics Editorsowie Grafikfenster private Final Consumption ( PFC ) data is presented in USD billion format edit! Do this quickly and easily, as illustrated below Version: 1.86 ( 04/2019 ) 0 Mit! Saved as “ CSV ” files log file, sort of Stata I with non-integers is _always_ precarious any! Auch über sogenannte DO-Files bedient werden units and few time periods they can used... Indian economy is chosen that looks like dat in the Stata Documentation were selected to demonstrate use. Than any trimmed mean any increment from the egen cut function not removed, but it can be via. Of the pertinent packages works differently: the values at the same percentiles as before ) and write resulting. 23, 2014, Statalist moved from an email list to a forum, based statalist.org... The egen cut function trim a variable you as an almost useless command, it... Any further commands ) data is presented in USD billion format they be... Below will create trimmed variables that are added to the tireless Nicholas Cox who wrote most the!
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