The structure of this command likewise can be found in the example I have provided on top of this page. Which answer is correct of course depends on the version of the test. To a professor having given his students two versions of a test and now having his computer judge whether the answers
#Spss code if syntax series#
To be done vary with a series of different conditions. If several transformations have to be performed given a certain condition and even more if the transformations Serves as a shorthand that may help to make syntax more transparent especially Most of what is important about this command can be found in the example on top of this page. If vara has a value that is not smaller than 1.7 and not bigger than 4.8, the variable newvar will have the value that is specified on the right hand, i.e. This is an abbreviation for a GE keyword combined with a LE keyword. RANGE helps you check whether the values of a variable are within a certain range. Thus, if vara has value 1 OR value 7 OR value 8 OR value 16 OR value 18, the IF clause will be coded as true and newvar will have value 3 for all cases that fulfill this condition. That is, you can check whether a variable has one out of several values, as in: Here, all conditions concatenated by OR are counted, as it were, as one "super"-condition (that is true if any of the three conditions as met), and this condition is linked to the other conditions by AND.ĪNY is an abbreviation for a series of OR clauses related to one variable. IF (gender EQ 1 AND (famst EQ 3 OR famst EQ 4 OR famst EQ 5) Note that the way SPSS behaves is exactly in line with modern logic. all persons who are divorced (no matter whether they are female or not and no matter whether they have children or not).all women who were never married (whether or not they have kids).This is because the clause is true in any the following cases:Īnd thus the following persons will get a value of "1" in the variable singlemo: You will find an amazing number of single mothers in your data. IF (gender EQ 1 AND famst EQ 3 OR famst EQ 4 OR famst EQ 5 You first will check whether a person is female (say, gender EQ 1) and if she is never married or divorced or widowed (say, famst EQ 3, 4 or 5) and if this is true, you have to check whether the number of children this person has is greater than 0 (nkids GT 0). For instance, you may be looking for mothers in your data who are not married. It is usually highly recommended to use parentheses to clarify the priorities of clauses. AND, OR and NOT are called logical operators. In addition, you may specify, instead of a condition having to be met, a condition that must NOT (symbol: ~) be met. Several conditions may be be concatenated by AND and/or OR clauses. If two conditions are concatenated by OR, the whole expression is true if one of the conditions is met. If two conditions are concatenated by AND, the whole expression is true only if both conditions are met. Several conditions (comparisons) may be concatenated by AND (symbol: &) and/or OR (symbol: ¦). When variables are compared to numbers or other variables, the following keywords or signs can be used: Key It is special inasmuch DO IF can be combined with other types of data That the expression after DO IF or ELSE IF is true. END IF clause permits to perform one or more transformations on condition This variable will be replaced by those you just created. However, if a variable is named that is already in the data set, the values of Usually, the variable to which a value is assigned IF the condition is Parentheses help to structure the priority of conditions. If thereĪre several conditions, you may specify whether only one, several, or all of these conditions must be met, by Section may be used, as in the expression "abs(vara)" used above. In addition, the arithmetic functions that are explained in the Compute The conditions after the IF clause usually compare one or several variables to numbers or other Left of the equal sign will get the value on the right hand of the equal sign. If this is the case, the variable that is named immediately on the IF checks whether the condition(s) that is (are) listed after the (vara gt 2 and abs(varb) le 7)) varz = 0. IF ((varx eq 1 and not missing(varu) and vari eq vark) or Conditional transformation create (or change) data values only IF a certain condition is true.
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