Converting country codes in stata and r irina mirkina. Hi, everyone, i have a question regarding matching of nonnumerical values. Required, if x is a data frame and no vector and only selected variables. If you want to import the data using stata, it is recommended to use the dialog boxes so that you do not inadvertently mistype a command or miss a vital option.
Of course, there is something artificial about choosing 0 and 1, for why. The following document provides an example of how to create. The strdate command converts these to numeric date variables with the same names. We can use these numbers in formulas just like any data.
Numbers disguised as strings a special case are variables where numeric values are stored as a string variable, including cases when the numeric values are stored together with some irrelevant characters. Chapter ii7 numeric and string variables ii95 variable names must not conflict with the names of other igor objects, functions or operations. Non numeric when numeric required warning appears in job log. Sometimes users need to convert the nonnumber values like, yesno, datetime into numeric value.
However, the other 3 variables contain system missings so we. Thats because the syntax is not properly specified. How to convert string into numeric in stata youtube. How can i quickly convert many string variables to numeric. Would anybody be able to download it for me and convert it to an excellegible file. Handling categorical data real statistics using excel. An example of when one might need to do this is if they needed to append.
How to run excel regression analysis with nonnumeric data. Apr 11, 2020 the output dataset created by xsvmat may be listed to the stata log, or saved to a disk file, or written to the memory overwriting any preexisting dataset. In a case where your string variables are in fact strings e. The logistics regression data analysis tool cannot analyze nonnumeric data, but alphanumeric data can be converted to numeric form using the real statistics extract columns from a data range data analysis tool example 1. This is one of my post that most of my audience asked, especially about how to prepare the good environment to work on your stata. The root problem there is likely to be a copyandpaste operation that copied too much. Check if numeric vector can be expressed as interger vector. Problem converting from factor to numeric variable in r. Nonnumeric values in a regression excel help forum. Note that we download official updates to stata about every two months. To get a list of stata updates, type the following commandhelp whatsnew.
The easiest way to convert string variables to numeric form is to use the encode command. It is not recommended to use pca when dealing with categorical data. You must tell destring to remove the comma then convert from str to num by using the ignore option. Converting numeric into string using the value labels. My stata subscription is no longer active as i currently have no real use for it, but for work i need a dataset where the mostupto date data is only posted as a. However, usually this is because when you read the data in there was something about your data that caused r to treat it as a factor instead of numbers often a stray nonnumeric character. To do this, you first need to know the name of the value label associated with educ. Note that you will not save space by storing full icd9 codes as numeric variables. Stata typically gives you a choice when importing by copyandpaste of whether the first row of what you copied is to be treated as variable names or as data, and you need the first choice, so. In linear regression with nonnumeric or categorical independent variables, you want a coefficient for each category except a default one.
Hello member of stata list i have a variable which have value like 4w12345678. Write a non numeric pattern using symbols on your keyboard, and label it non numeric, and either repeating or growing. If you recorded the missing values for a string variable using some kind of nonblank indicator for example, 999 or 999 and have already defined that usermissing value in the variable view window, automatic recode will preserve the missing designation, but will still convert the category code to be in the range of the other categories suppose that the below syntax was applied to a. Create a numeric pattern, and write the rule for your pattern. Simple methods to deal with categorical variables in. Convert stata business calendar dates in readable dates. In this post, i would like to show how to convert a numeric date to stata date. To convert nonnumber values, you dont need to manually enter the corresponding value, excel 2010 offers a simple formula which can evaluate any supported nonnumber and show its respective number value. Id drug id 1 d06662 2 d06665 3 d04878 4 d05048 now suppose d06662 is a drug for hypertension, which i want to code into 1, and all else into 0. It is still a character variable because our prior destring command saw the x in the data and did not attempt to convert it because it had non numeric values. The stata command destring and encode could be used to convert string variables to numeric variables.
For time calculations such as the number of days between two dates proper date variables are needed. How to convert various nonstandard date formats to. While the four date variables youve created are perfectly functional dates as far as stata is concerned, theyre difficult for humans to interpret. Linear regression on non numeric variables in r cross. Say that we have date variable in the following format and we want to convert it to stata format. Intercooled stata has a limit of 2,047 variables and with that the macros will only produce the zscores output files see below the macros section exported files, point 1. To be able to perform any mathematical operations, your variables need to be in a numeric format. Log file log using memory allocation set mem dofiles doedit openingsaving a stata datafile quick way of finding variables subsetting using conditional if stata color coding system. Hi all, i have a numeric variable that contains no numeric and missing values in some cases. Converting nonnumeric matrix into numeric stack overflow. About converting a categorical variable into a numeric. Yes a factor is stored as the integers from 1 to the number of levels and as.
I assume you mean you have columns of data but in some columns andor in some rows there are cells with text or non printing characters in them. I have an imported table with longitudes and latitudes and want to create a spatial grid from them. Mar 09, 2019 converting variable types from character to numeric numeric data are sometimes imported into variables of type character and it may be desirable to convert these to variables of type numeric. Note that it is not possible to directly change the type of a variable. When i run the regression however, i get a popup that says regression input range contains non numeric data. Since weve 480 cases in our data, were done for s1. Nonnumeric when numeric required warning appears in job log. B which was running with a french locale whihc use, as the decimal delimiter.
Title destring convert string variables to numeric variables and vice versa syntax options for. There are no observations because regress, along with most of statas analytic commands. System variables system variables are built in to igor. The following document provides an example of how to. Stata can store numbers with differing levels of precision, as described in the table below. First lets look at the case where missing data is coded as one or more nonnumeric characters. Hi, i have to check the data in varchar2 field idtr and if it is numeric some actions are to be done on the data and if it is numeric some other different action is to be done. It converts between iso codes both alphabetic and numeric, correlates of war alphabetic and numeric, imf, library of congress, unctad, and country names. Below we can convert it to numeric by include the ignorex option that tells destring to convert the variable to numeric and when it encounters x to convert. Download table 2 data set missing data coded as xls, 0. In general, there is no way to get them back unless you have saved them, any more than you can get back the original values from int81. D19 on the left side of figure 1 to numeric form figure 1 categorical coding of alphanumeric data. If so, thats text and its inconsistent with a numeric variable. As adjectives the difference between numeric and numerical is that numeric is of, or relating to numbers, especially the characters while numerical is of or pertaining to numbers.
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. Storage types are str6 and str, and display formats are %9s and %s, respectively. Convert character to numeric in r example for string. However, sometimes it makes sense to change all character columns of a data frame or matrix to numeric. Jul, 2017 convert variables from string to numeric in stata earnings management data. How to convert numeric date to stata date stataprofessor. As a noun numeric is mathematics any number, proper or improper fraction, or incommensurable ratio. Non numeric values in a regression in the two columns the x and the y, all values are numeric and i have verified this by formatting the cells and selecting number. Stack overflow for teams is a private, secure spot for you and your coworkers to find and share information. Ive tried converting some variables in a dataset of about 200k observations from string to numeric the following ways. If the variable is actually a numeric value that just happens to be stored as a string, see our faq. Converting data using stattransfer i will now demonstrate using stattransfer the demo version to convert an spss file into stata format. It recognizes complex country names with or without thes, commas, periods, dashes, and double spaces.
Not surprisingly, stata requires the numeric variable to be labeled. Mar 10, 2015 first, we use charlist to check whether is the only nonnumeric character that complicates our use of destring. As you have seen, to convert a vector or variable with the character class to numeric is no problem. Because you will likely use a dot with a numeric variable, stata will store. Linear regression on non numeric variables in r cross validated. Posted 08192014 3629 views in reply to nketata you can control the import type for a field from excel via dbsastype option, but this is more of an infile method in that youll need to hardcode it for each file rather than automatically import the file. In some cases, the digits of a numeric variable may represent year, month and day. View notes ddestring from sef k24 at curtin university sarawak. Windows users should not attempt to download these files with a web. That will show up in the fourth column of stata s output if you run des educ. 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. You can either let r do this for you, by just adding the variable asis to the model, or convert it to a factor yourself.
Userwritten additions to stata published in the stbs are available from statas web site for download just as are the official updates. How to convert many character variables to numeric using a macro. A very basic question i would appreciate help with. If string make sure the categories have the same spelling i. That means excel might not be able to run its regression routines at all or properly. It creates an output dataset or resultsset, with one observation per row of an existing matrix, and data on the values of the column entries in. In linear regression with non numeric or categorical independent variables, you want a coefficient for each category except a default one. To convert such dates to stata dates, use the mdy function. Except for the first column, these data can be considered numeric. Unlike decode, sdecode creates an output string variable containing the values of the input variable as output by the list command and other stata output, instead of decoding all unlabelled input values to missing. Convertic nonnumeric factor to numeric column with mapping. I know i sometimes make things seem more complicated than they really are. Hi all, i have a numeric variable that contains nonumeric and missing values in some cases. This module may be installed from within stata by typing ssc install strdate.
How can i convert string variables to numeric variables in. You can rename a variable using the rename operation, or the rename objects dialog via the misc menu. I want to map them to an integer column with values in the range 2, 2 for regression, with some values mapping to the same thing. Additionally, rather than setting values for those cases containing nonnumeric values to missing what the function real does, destring removes the specified nonnumeric. Stata module to convert a matrix to variables in an. So i used some logic for finding whether the data is numeric or non numeric which i got it from the net. I want to be able to specify the explicit mapping, so that very hot words map to 2, very cold words to 2, etc. How can i turn a string variable containing dates into a. Reed college stata help changing string variables to. That numeric value is what stata actually stores in active memory and is what it will try to compare educ to in each observation. Merging two datasets require that both have at least one variable in common either string or numeric. Converting variable types from character to numeric. Stata module to replace string date variables with. Running this command will cause stata to make a new numeric categorical variable wherein the data has labels that correspond to the old string values.
Learn more convertic non numeric factor to numeric column with mapping in r. Typing in data, changing variable names, adding labels, and adding values duration. Cast e convert transactsql sql server microsoft docs. How to convert excel numeric dates to date data type in r.
String to numeric conversion problem with destring command. For stata, the package kountry by rafal raciborsky. If you do not assign a value to a numeric value, it is automatically 0. With either option, if any string variable contains nonnumeric characters not specified with ignore, then no corresponding variable will be. In order to convert a string variable containing any nonnumeric value using destring one must list the characters that should be ignored e. Spss how to convert string variables into numeric ones. How can i quickly convert many string variables to numeric variables. I have tried to convert it string to numeric using destring and it. Convertic nonnumeric factor to numeric column with. So, the data has been represented as a matrix with rows as. Dear stata list, i am trying to convert a string variable. This question, or a some variation of it, is one of the most common icdrelated topics that we see in technical support. Additionally, rather than setting values for those cases containing nonnumeric values to missing what the function real. I have a factor in a data frame with levels like hot, warm, tepid, cold, very cold, freezing.
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