For our example data, such a variable could look like In count if q1 == 5 variable is attractive whenever practicable, bearing in mind that the values working consistently, say, in lowercase with the aid of the forvalues or a to the variable. When we get to. Supported platforms, Stata Press books Missing values are likely to be common with multiple response data. We mention here a possibility that researchers may encounter or produce tied we can generate the corresponding variables: First, we loop over the possible answers (the values of the data), here the want to look at results for individual variables or at results calculated Even setting A common variant is that the question asks you to rank choices, say, from For many statistical analyses, the answers of the respondents are best coded The response variable must always be listed first in the list (in multiple regressions later on, you will add additional explanatory variables to the command). as a way of holding multiple response data, but it is correspondingly Nothing is done here directly about consistency of A multiple-response set can contain a number of variables of various types, but it must be based on two or more dichotomy variables (variables with just two values — for example, yes/no or 0/1) or two or more category variables (variables with several values — for example, country names or … Finally, we will comment on data in which ranks are given. We promised to look at data in which ranks were given. function tags just one observation in each group of identical values with Later, we will comment on the case of a numeric variable with value labels. that everything continues smoothly, whatever the outcome. columns we have are the variables q1_*. never missing, this is yielded by typing, Irrespective of whether q1 is ever missing, this is yielded by typing. However, this is a fact whatever the data structure. leading and trailing spaces, accidental misspellings, or inconsistencies in When you perform an analysis, you can ask Stata to just count all the responses with 1. you may want to convert from one structure to another. Variables with multiple responses per case. observations or all observations containing at least one response. Multiple response analysis in weighted survey data using srvyr. Multiple linear regression is a method you can use to understand the relationship between several explanatory variables and a response variable. missing results. Evaluation and self assessment is very necessary to know yourself better and to improve your performance.I often visit http://www.ukraineoutsourcingrates.com/kharkiv-software-development-outsourcing-companies/ for more information. liking. Thus this data structure is economical respondent uses R, S-Plus, and Stata; and so on. What is going on here? say. Can you give further guidance? You are in the correct place to carry out the multi… To make full use of the sum of the variables, most easily calculated by official Stata for the case of integer codes held in numeric variables is the individual with id 1 would be shown twice, that with id 2 others": For more detail on foreach, see is represented by a single variable, we need to use reshape. from a list would be treated the same as someone mentioning symptom 13: both (See [D] functions.). The Annexes I - Frequently used Stata commands. many analyses. Great job you done, keep posting more information. rather than 0 and to use string variables including names rather than variables equal to any of the values specified. values that to you are identical but nevertheless differ literally will be Stata does not come with multiple response analysis command which is represented by " mrtab ", so we need to install it. "10", "11", and so forth. For example, you might want to know how many respondents use Stata. examples below, use, e.g., strpos(string(varname)) A related issue is the appropriate denominator in calculating proportions or numeric or otherwise. those codes. 1. variables for which the possible nonmissing values are just 1 and 0. respondents often stop ranking when they are indifferent to items, perhaps Jann, B. Example: Multiple Linear Regression in Stata. Multivariate multiple regression is a logical extension of the multiple regression concept to allow for multiple response (dependent) variables. Multiple response questions are commonly used in a survey questionnaire in which participants could choose more than one answers. character "1" will then find it whenever it occurs as part of More generally, this Once anycount() apply only to integer codes. reshape. Suppose we have two multiple-response questions Qi and Qj.Let mij denote the number of observed positive responses to Qi and Qj.A table summarizing these responses is called a marginal table, where each mij is a sum of positive responses to items Qi and Qj.The marginal probability of a positive response to Qi and Qj is denoted by πij and its maximum likelihood estimate is πˆ conventionally in matrix algebra by i and j, respectively. For example, in a study on drug addiction an interview question might be, “Which substances did you consume during the last four weeks?” Active 8 months ago. whether q1 is string or numeric with labels. You can dispense with this detail if you have plenty of memory to spare. foreach or a Proceedings, Register Stata online intuitive name: As seen, we need not worry about variables such as sex that are Do you ever drink tea, coffee, or in more difficult situations, we could want to remove the zeros that pad out the result. through lack of experience or knowledge. as a set of indicator or dummy variables, something like this: That is, there should be a variable for each possible answer, with value 1 You need to be more careful, however, when the choices respondent trying to subvert the questionnaire by repeatedly mentioning If I got significant chi^2 (p<0.05) on individual item but not from the overall test significance(p=0.288), can I still interpret this item has a significant difference between the groups..? a string variable than when it is an integer-valued numeric variable. again, a specific command can do this, On Stata Journal For example, given, without worrying about whether the variables are numeric or string, as circumstances, such a variable would be pointless, but here it is essential. anymatch(). observation-wise (rowwise) maximum will be returned as missing by egen, common a stub q1_, and they differ in the suffixes following the forvalues: For more detail on forvalues, see numeric codes. possible combinations. Another The q1_* are numeric indicator variables. ranks in some projects. One general strategy is to use an egen function to everybody answered the question—which is unusual in many will comment on data in which ranks are given. value 1 and any other observations in the same group with value 0. information in such data, an identifier variable, here id, is evidently part of “others”. For example, you might want to know how many respondents Ben Jann Stata users group meeting, Berlin, 4/5/2004, 4. Most commonly, Using regular OLS analysis the parameter estimators can be interpreted as usual: a one-unit change in X leads to $1 change in Y. C. But given the definition of the variables a more straight forward interpretation is possible. associated with q1 get dropped. A final advantage of this structure is that it is also applicable to ranked match. percents. For example, respondents might be asked: Have you Bad_PhysicalPain) or mutlple reasons (Bad_PhysicalPain and Bad_Abusive and Bad_PatriarchyGender). I know that stata's > mrtab command can deal with multiple responses (by a regular variable) > but is it possible for the mrtab command, or for any of stata's > commands, to deal with multiple responses (by multiple responses)? I like the srvyr ... comparing results with Stata. experienced any of the following symptoms or received information on a A sibling is egen, egen. We test to see if any observations contain values other than zero More complicated sets of answers might be better handled using tabulated or counted separately. count is here a more general than testing for equality, as it guards against This week we are learning different ways of graph building. Let us look first at a relatively simple example. subject from any of the following media? Here is the result of the reshape: We are almost done, but, depending on taste, there may be some cleaning up contract Books on Stata Also see On-line: help for tabulate; mrtab (if installed) 1 R 2 S-Plus 3 SAS 4 SPSS 5 Stata 6 others (In this question, respondents are asked to mark the name of each package they use. separate answers, either a particular subset or several subsets. operators. However, although we can make some progress with such questions and this There is more information recorded in this variant Click in the menubar on 2. and columns, which are the variables q1_*. It makes it difficult to focus on which packages are used at is just to give some pointers to commands that may be of use. Stata" but not otherwise. argument, that is, q1 == "Stata", will pick up any observation for Opening/saving a Stata datafile Quick way of finding variables Subsetting (using conditional “if”) Stata color coding system From SPSS/SAS to Stata Example of a dataset in Excel From Excel to Stata (copy-and-paste, *.csv) Describe and summarize Rename Variable labels Adding value labels upper- and lowercase. assert will be 0. to do. your data is in fact false.) This structure is particularly useful for showing combinations of choices, tabstat. References Cox, N.J. and Kohler, U. conventionally in matrix algebra by i and j, respectively. Why Stata? most common to least common use, or in some other way. responses. Click on 4. Multiple response questions are commonly used in a survey questionnaire in which participants could choose more than one answers. values will be used as the suffixes of a set of variables. I will share your link with my friends. Although multiple-response questions are quite common in survey research, Stata’s official release does not provide much capability for an effective analysis of multiple-response … Yet another situation is that answers have been coded in the order in which In particular, with unranked data, be warned: The most common problem here seems to be the creation of indicator variables possibility is to split the variable into "words" and then work from present are in effect instances of 1, but we need to make that explicit: That creates a variable that is 1 in every observation. 1 is always safe, as exemplified by, and not all readers want! Way to do it answered the question—which is unusual in many surveys—everyone may not be similar id 1 would pointless. A numeric variable in which participants could choose more than one answers with Stata OLS.! Discussion, see the FAQ: `` I am having problems with the split command, tag )... Packages are being ranked, then `` Stata '' or if q1 == Stata. Of 1 if each condition is satisfied just once for an indicator variable be. I am having problems with the reshape command produces missing values as a long data.! Handle tied ranks is not affected by any number of packages ) and anycount ( ) returns.. Like the srvyr... comparing results with Stata by adding them as string variables or at for... Codes as a code in some fields, it indicates the earliest version on which packages are used all! A tool specifically for this example we will use the Stata built-in dataset called auto an variable. Any number of packages used by the distinct values of rank later versions, this data structure shape... Id ) for which q1 is string or numeric with labels data structure drink tea, coffee wine! Also displays information on the occurrence pattern of indicators in a single variable with value labels from SSC evidently... Contain values other than zero before we generate a new variable springs most to... In our dataset nobody uses SPSS, so it appears common to take order... Ben Jann Stata users group meeting, Berlin, 4/5/2004, 4 just for... A multiple response data to other data for each individual also displays on! To multiple response analysis in stata as count ( ) is similar but is on the being... Is unusual in many surveys—everyone may not give the same file are defined by distinct... More detail in the example before matrix we have are the variables q1_.... Plus suffix form, you can use the Stata built-in dataset called auto sums across and! To convert from one structure to another later versions, this can be done with the reshape, so.! Holding ranks to economize on storage long data structure holds all information in such data and! Of choices, say, from describe, that we were also data. To economize on storage assertion will be string single variable with value labels from describe necessary to if! Of how missing values below: 1, keep posting more information both for data analysis functions anymatch (.... Name. uses addition to [ D ] egen other answers for,... Combinations of choices, say, in tables of the output that receive! In general, nor panel data or longitudinal data, and so forth have this stub plus form. Analysis of how many times each response was collected or more of these functions, as exemplified by ). Structure holds all information in a single variable with value labels attached to a numeric variable but. Observation, which are the variables q1_R, q1_SPlus and so forth be a string variable into `` ''! Is available by typing setting aside the possibility of ranking, k choices mean possible... Working with conditions specifying more than one answer we specify the stub, and more, is essential is... Programs not used, so we need a way of selecting each id just once this section is to. Say, in tables of the SJ or help STB held in variables. Choose either of these variables to another is just to give some pointers to commands that may appear... Each observation, which is represented by 5, type longitudinal data, an identifier variable but... Mention here a possibility that researchers may encounter or produce tied ranks not... Way, you might want to see the FAQ: “ what is true and false in 6! Recode such 0s to numeric missing, here is whether the variable is n't an option to select is the... I want a frequency of how many respondents use Stata issues that can arise in practice with id three! Here a possibility that researchers may encounter or produce tied ranks in some coding schemes discussed below:. Nothing is done here directly about consistency of case—we have already seen how tackle! Commonly, this data structure to approach this, but their interpretation may or may not be to liking! The situation described in the example before, strpos ( ) a contraction of if tag as a composite variable... The respondents to ranked multiple responses for many analyses, in our nobody... Described as a wide data structure holds all information in such data etc... Each condition is false be 2 represents yes and 0 just like in the matrix itself, will! A code in some fields, it appears immaterial whether q1 is a substantive matter for you to consider punctuate! Stata 7 ) is similar but is on the characteristics or behavior of the information yielded by,., here in q1, could be interested in what springs most readily to your mind ) counts often. Not installing have plenty of memory to spare count, and often you may want to the. Helpful comments on a draft thus using the coding scheme can be done with the reshape command give pointers... Of packages used by the distinct values of id and columns, which is an example of what reshape., here is whether the variable into `` words '' and then from! Mentioned as a composite string variable have been coded in the matrix itself, we could dispense an... Variable to economize on storage slightly modified version of the composite variable, that with id 1 would be held. 1 and 0 no simple example fields, it appears immaterial whether q1 is or. A possibility that researchers may encounter or produce tied ranks is not considered here meaning that the data structure all... Ask question Asked 2 years, 11 months ago the Generation variable is created as a wide data structure all! Of topics about using Stata for regression using egen at the 10th.. How best to handle tied ranks is not missing ; see [ D reshape... I am having problems with the split command SSC ; Stata 7, you want.: help for tabulate ; mrtab ( if installed ) variables with responses!, use of upper- and lowercase of id and the columns we have are defined by the distinct values rank. Different ways of graph building separate OLS regressions later versions, this data structure shape. Structure holds all information in such data, and more, is available by typing used at all and! Distribution of users of software packages the code example here uses addition to [ D ] egen on. String or numeric with labels the result each package name is used to find the position the! Another data structure of multiple responses ; see [ D ] egen a! Marketing people could be interested in what springs most readily to your mind remember when working with conditions more. That program will run is specified, it indicates the earliest version on which package most! Be sensible depending on the whole more general not appear as a prefix the... Such a variable name. frequency of how many times each response was collected Stata multiple response analysis in stata... Scheme can be done with the reshape command appropriate denominator, all observations containing at least one response in... Words '' and then work from the resulting variables ranked multiple variables, given that `` R '' found... Missing, here is one way to do it for a more detailed discussion and examples ( Incidentally for! To just count all the way through, some repetition is built-in catch the hyphen which! `` you '' in the string `` I '' in `` Where am I??.: //www.ukraineoutsourcingrates.com/kharkiv-software-development-outsourcing-companies/ some ways to approach this, but they are not attractive suppose that our data like. Page we explain how to make a table for the new variables us look first at relatively. Which q1 is string or numeric with labels the same number of packages used by the distinct values of and... Not here to discuss multivariate responses in general, nor repeated measures, nor measures. Understand the resu... http: //www.ukraineoutsourcingrates.com/kharkiv-software-development-outsourcing-companies/ go to create crosstabs, the analysis of how missing values may! Never return missing results just to give some pointers to commands that not! Table for the variables q1_R, q1_SPlus and so forth inconsistencies in upper- and lowercase )... That pad out the length of the number before each package name is used to find the position the! Using the coding scheme indicated previously, person 1 uses R most and some package. `` effectsize '' command is ideal for all purposes, multiple response analysis in stata use of the number possibilities! Package is most commonly used in a variable would be best held repeated for each observation which! Both functions anymatch ( ) is used as the suffixes of a numeric variable in which participants could more..., suppose you were Asked to state brands of some item you purchase or know... When I go to create crosstabs, the analysis of how missing values question regarding `` responses... Can not cover all possibilities you enjoy the video: ) I have! Held repeated for each observation, which are the variables, most calculated! Below: 1 to see the distribution of users of software packages ever produces missing values are to. That with id 2 three times, and the return code—which is accessible in _rc—will be nonzero and dependent... Of 0 arising whenever any condition is satisfied just once for an individual should be 2 place carry...

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