Type
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Description
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Boolean variables
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A special type of integer variable that can contain values of True or False.
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Blocks
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Group one or more questions into blocks.
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Categorical variables
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Have a limited number of distinct values or categories, such as a variable based on a question that has a predefined set of answers. Categorical variables are either single response or multiple response.
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Coding variables
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Store the responses to open-ended questions after they have been sorted into categories. The process by which the responses to open-ended questions are sorted into categories is usually called coding.
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Compounds
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Contain a number of related questions that are presented as a group using a shared list. A compound question is not the same as a grid question, although a compound question may contain one or more grid questions.
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Date variables
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Store date and time information.
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Filter variables
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These are Boolean variables that have been specially designed for use as filters.
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Grids
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A special type of categorical loop in which all of the iterations are presented simultaneously to the respondent in a grid format. Grid questions often ask respondents to choose a rating on a predefined scale for a number of products in a list.
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Hidden variables
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These are variables of any type that have been defined as hidden variables. Choosing to display hidden variables in this dialog means that any variables you have hidden using the Hide Variables dialog box are displayed in the Variable List. For information about defining variables as hidden and removing the hidden status from hidden variables, see Hide Variables dialog box.
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Loops
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Define a set of questions that are to be asked more than once. In a categorical loop, the number of times the loop is to be iterated (and therefore the number of times that the set of questions in the loop are to be asked) is controlled by the categories in a category list. For example, the set of questions can be asked for each product in a product list. In a numeric loop, the number of times the loop is to be iterated is controlled by a numeric expression.
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Numeric variables (Long)
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Store an integer value for each case.
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Other Specify variables
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Store the open-ended responses to Other Specify categories. These are special categories that allow the respondent to enter an answer that is not on the category list. For example, in a question that asks which other museums the respondent has visited, there are categories specifying six major museums, and one category with the text "Other". When respondents select this category, they are asked to enter the name of another museum they have visited.
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Source file variables
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Store the name of a file that contains an image or recording of a question response (such as a .TIFF file containing a scanned image of a handwritten response or a sound file that contains a recording of an open-ended response in a CATI interview).
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System variables
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Store standard information, such as the respondent's serial number, the mode of data collection used, the version of the questionnaire used to collect the data, etc. Some data sets (such as Quanvert databases) do not have system variables. See System Variables for more information.
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Table variables
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Variables that have been set up from the top or side axis using the New Variable from Side/Top option.
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Text variables
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Store data that is text, such as names and addresses, or responses to open-ended questions
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Weight variables
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Special numeric variables that have been set up to weight the data. You use weighting when you want the figures in your table to reflect your target population more accurately than the actual figures do. For example, suppose your target population consists of 57% women and 43% men, but you interviewed 50% women and 50% men for your survey. By applying weighting, you can make the women's figures count for more than the men's figures, so that they more accurately reflect the gender distribution in the target population.
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