What command can i use to select variables containing. Stata is not sold in modules, which means you get everything you need in one package. Mar 21, 2019 working with stata the stata starting screen. Manipulation data analysis with stata library guides at. If the variable is actually a numeric value that just happens to be stored as a string, see our faq. An example of when one might need to do this is if they needed to append. In this post, i will provide a brief tour of working with dates that will help you get started using all of statas tools. Stata is a popular statistical program at the sscc that is used both for research and for teaching statistics. Sorting a dataset rearranges the rows with respect to one or more variables. Moreover, as bug fixes and new features are issued frequently by statacorp, make sure that you update your stata before posting a query, as your problem may.
Hi all, currently working on an undergrad research project which aims to determine if a gender gap exists in male and female pensions. You can also use the software stattransfer to transform the data from excel to stata format. The following document provides an example of how to create. How to extract few letters of a string variable in stata. In stata, how do i calculate frequency for variables and.
In stata, you can use the contract command to calculate frequency for variables and save your results into a new data set. It will sort the variable based on the alphabetical order of values of variable, not on order of frequency of values. When you sort on a string variable, however, null strings are placed. This tutorial discusses how to sort data using the dropdown menus in spss. Then, for observations with common var1, stata will sort them according to var2. A string variable when sorted is necessarily in alphabetic order, or more generally the order given by the string characters used. Assume there are several cases with the same value in caseid.
For instance, sort alphagamma means to sort the data in ascending order of alpha, within equal values of alpha. By default, the center of your stata screen is dominated by the results window. How do i sort values of string variable based on the order. Im new to stata and wanted to know if some of you could answer a very simple question, please. We are here to help, but wont do your homework or help you pirate software. Press question mark to learn the rest of the keyboard shortcuts.
When tabulating a string variable, stata will sort 12 before2. You can have dates in years, months, or even milliseconds. This function can be used to sort list of integers. This string exclusive was produced just for us in italy. What command to use in stata to check if value in one variable is equal to any value in another variable. Login or register by clicking login or register at the topright of this page. Hi, i have two variables name and name1 that contain strings. This video demonstrates how to convert categorical string variables to labeled numeric variables.
The sort function can be used to sort the list in both ascending and descending order. Which convention is better for you will depend on your purpose. Count observations by group statalist the stata forum. After all, you dont want to estimate an econometric model with data thats mostly incomplete or full of errors. For example, you can use the split, join, and sort functions to rearrange the string array names so that the names are in alphabetical order by last name split names on the space characters. How to create a date variable from a date stored as a string. How can i quickly convert many string variables to numeric variables. Stata is a good tool for cleaning and manipulating data, regardless of the software you intend to use for analysis. Most software applications also allow sorting by multiple variables. To output the data to a commadelimited file that can be read by spreadsheet software like excel, use the outsheet command. Stata for students is focused on the latter and is intended for students taking classes that use stata. Mar 15, 2012 stata is a statistical computing package widely used in the business and academic worlds. Most stata commands save results in variables so you can use them later for example, if you type help summarize, the last item in the help window is a a list of stored results another way of obtaining the list is by typing return list or ereturn list stata is always well organized, which is great for stata but sometimes. Stata has a wide array of tools to work with dates.
For a list of topics covered by this series, see the introduction. Stata is available on the pcs in the computer lab as well as on the unix system. I figured it has something to do with string variables, but i could not find a solution. The first index of the hashed array will represent character a, second will represent. After starting stata, the display will show an overall stata window consisting of several subwindows.
Its a common mistake when importing data to accidentally make stata think a numeric variable is a string. In order to see what a string variable looks like, we can use the converse command, tostring, to create a string variable. The exact setup of these windows has changed several times during stata s history. How can i turn a string variable containing dates into a date. An efficient approach will be to observe first that there can be a total of 26 unique characters only. Matlab provides a rich set of functions to work with string arrays. This article will introduce statas user interface and teach you its basic syntax. Whats the difference between gen and egen in stata 12. Stata complains because it does not understand descending sorts gsort is an ado. The county sort will be applied within each sorted region. The sort option tell stata to sort the data by rep78 before executing the rest of the command. And i want to obtain the top ten diseases that occur most frequently in the dataset. What command to use in stata to check if value in one.
Sorting in stata is reasonably efficient a million random values can be put in increasing order in 3 seconds with sort x however the sort command doesnt have a inverse option to sort from high to low. Suppose you want to get the sum of a variable x1 and the mean of a variable x2 for males and females separately. Statas collapse command computes aggregate statistics such as mean, sum, and standard deviation and saves them into a data set. What its string or numeric values are, or how they are labelled, is then. How can i produce a tabulation of a string variable that is listed in logical rather than alphabetical order. If there are 2 variables, var1 and var2, after sort, stata will sort the observations according to var1 first. If there are more than 2 variables, then the observations will be sorted by the first variable first, then the second variable second, and so on. Unlike rowsort, sortrows operates on vectors, and is faster than looping through observations. Stata will sort the data in ascending order by default. The,replace at the end just means that if a log file of this name exists in this folder then write over it this is useful if you are running the syntax for a project multiple. How can i convert string variables to numeric variables in stata. With only a single variable, one can do this without gsort.
The first example will use commands available in base stata. We use it at the world bank and its great to see a new version of the wbopendata module that gives stata users direct access to much of the data on data. In stata, how do i get aggregate statistics and save them. The local command is a way of defining macro in stata. Over the years, ive learned that stata is a powerful data analysis software data management, graphs and statistics. This type of sorting will be executed in a predetermined variable priority, for example, a data set containing region and country fields can first be sorted by region as the primary sort and then by country. The resulting sort key for a specified string is a sequence of bytes that can differ depending upon the currentculture and the compareoptions that you specify. Stata is a complete, integrated software package that provides all your data science needsdata manipulation, visualization, statistics, and automated reporting. Stata program to perform sort within observation, statistical software components s456512, boston college department of economics, revised 28 nov 2006. Im confused as to why they have the same number of mismatches, is it because one of the datasets is using a long versus a string. Ive noticed than many numerical sorting methods seem to sort by 1, 10, 2, 3. Stata news, code tips and tricks, questions, and discussion. Program to sort string in descending order geeksforgeeks. If you sort on any variable, only the order of the observations changes, not their values.
If you map to a numeric variable, you can use value label definitions to insist on a different order. Im planning on using the blinderoaxaca decomposition to show the difference in means between the two groups, but im not entirely sure on how to use it in stata. Ordering the results of a tabulation of a string variable stata. Copy paste from excel to stata is strongly discouraged as the accuracy of it may depend upon the data format in excel and data format settings in stata to save the dataset in stata format. The values of string variables are red in the data browser. The second command formats the numeric value so that when stata displays the date, it is in a form that is easy for humans to read. A decreasing sort national bureau of economic research. The easiest way to convert string variables to numeric form is to use the encode command.
Using reverse on a string variable does not make it possible to sort the. Stata module to sort a single variable via egen, statistical software components s424801, boston college department of economics, revised 24 oct 2002. Adding categorical string variables to regressions. Written and illustrated tutorials for the statistical software spss. String variables often come with typos, different spelling, etc. Dec 01, 2016 this video demonstrates how to convert categorical string variables to labeled numeric variables. This stata faq shows how to check if a dataset has duplicate observations. May 07, 2016 merge datasets by partially matching key variables in stata i work with messy administrative data and very often have to merge datasets by peoples or cities names. Then, for observations with common var1, stata will sort them according to. Maximum number of unique values in the array after performing given operations. What command can i use to select variables containing specific pattern in stata. Using the option stable will make stata keep the order of cases within the same value of caseid after sorting that is, the first value with a given caseid in the original data will also be the first case in the sorted data, and.
This presentation shows the benefits to the user of stata software jointly with. It can sort both numeric and string variables, and allows for either the replacement of the. This product is currently unavailable for purchase. The dataset is marked as being sorted by varlist unless in range is speci. For example, a sort key might contain a string of alphabetic weights, followed by a string of case weights, and so on. When you see mixed word and number sorting that treats numbers correctly, its because the sorting is more intelligent, and on top of that, still usually only works at the beginning or end of a string. Throughout, bold type will refer to stata commands, while le names, variables names, etc. Basics of stata this handout is intended as an introduction to stata. Before you begin doing econometric analysis, make sure youre familiar with your data and how to view it in the popular stata software.
Reorder variables in dataset, based on its values stata. In fact, i have a list of diseases, which is coded before and entried in excell. Im having trouble coming up with a scenario where i would need the first method and, as a user, i get frustrated whenever i see it in practice. Manipulation data analysis with stata library guides.
If we wanted to examine the price by mpg, we would need to sort miles per gallon. Merge datasets by partially matching key variables in stata. I cant seem to find the answer for what is long on the stata website. Sometimes, before stata can perform some task, the data must be in a speci. For example in the same row name can be john smith. How can i create a variable that counts various visits with the time. Note that while using list, and some other data display commands, produces values that look like string dates, the actual values stored by stata are numeric. If you have questions about using statistical and mathematical software at indiana university, contact the uits research applications and deep learning team. If youre new to stata we highly recommend reading the articles in order. Splitting changes names from a 5by1 string array to a 5by2 array.
Net framework, the sortkey class maps strings to their sort keys and vice versa. Usage and syntax this is part two of the stata for researchers series. Think about languages that use diacritical marks and you have a complete mess. When you execute the command, an existing data set is replaced with the new one containing aggregate data. So, we can store the count of occurrences of all the characters from a to z in a hashed array. And, you can choose a perpetual licence, with nothing more to buy ever. A detail important here is whether the variable really is a string variable or despite our general advice a numeric variable. Getsortkey method to create a sort key for a string that you specify. How can i compare whether the strings are the same or not. One way to sort data is using a simple sort command followed by the variable name.
I implemented a short program vorter a combination of values, sort. Sorting and string comparison globalization microsoft docs. Descriptive statistics mean, median, variability 30 may 2011 tags. It is fairly easy to transform data between wide and long forms in stata using the reshape command, however youll want to be careful when you convert a dataset from one form to another so that you can eliminate possible mistakes in the process of transforming. Here we introduce another command local, which is utilized a lot with commands like foreach to deal with repetitive tasks that are more complex. But if you wanted to compare strings regardless of order of characters.
51 968 1335 1138 172 626 144 1484 561 1331 1471 757 1019 413 382 243 920 1025 630 36 1440 1215 1155 1198 239 1182 923 1187 1056 994 1060 1287