Coding Help

Question

So I am trying to calculate a percentile and t score for two separate categories within one question. This is the code I have. However, no matter the answers I input I get the same t-score and percentile so clearly I am doing something wrong. Qualtrics.SurveyEngine.addOnReady(function() {    // Convert Likert scale responses to numerical values    function likertToNumeric(value) {        const scale = {            "Never": 1,            "Almost never": 2,            "Sometimes": 3,            "Often": 4,            "Almost always": 5        };        return scale[value] || 0; // default to 0 if value not found    }    // Calculate sum of responses    function calculateSum(variables) {        return variables.reduce(function(accumulator, current) {            var response = Qualtrics.SurveyEngine.getEmbeddedData(current);            console.log(current + ": " + response); // Debugging: Log each response value            return accumulator + likertToNumeric(response);        }, 0);    }    // Calculate T-score    function calculateTScore(sum, mean, sd) {        var tScore = 50 + 10 * ((sum - mean) / sd);        console.log("Calculated T-Score: " + tScore); // Debugging: Log calculated T-Score        return tScore;    }    function mapTscoreToPercentile(tScore) {        if (tScore >= 66) return 95;        if (tScore == 65) return 94;        if (tScore == 64) return 92;        if (tScore == 63) return 91;        if (tScore == 62) return 88;        if (tScore == 61) return 87;        if (tScore == 60) return 84;        if (tScore == 59) return 82;        if (tScore == 58) return 79;        if (tScore == 57) return 77;        if (tScore == 56) return 73;        if (tScore == 55) return 70;        if (tScore == 54) return 66;        if (tScore == 53) return 61;        if (tScore == 52) return 58;        if (tScore == 51) return 55;        if (tScore == 50) return 50;        if (tScore == 49) return 45;        if (tScore == 48) return 42;        if (tScore == 47) return 39;        if (tScore == 46) return 34;        if (tScore == 45) return 32;        if (tScore == 44) return 27;        if (tScore == 43) return 25;        if (tScore == 42) return 21;        if (tScore == 41) return 19;        if (tScore == 40) return 16;        if (tScore == 39) return 14;        if (tScore == 38) return 12;        if (tScore == 37) return 10;        if (tScore == 36) return 8;        if (tScore == 35) return 7;        if (tScore == 34) return 5;        if (tScore == 33) return 5;        if (tScore == 32) return 4;        if (tScore == 31) return 3;        if (tScore == 30) return 2;        if (tScore == 29) return 2;        if (tScore <= 28) return 1;    }    var firstGroup = ['stress24', 'piling24', 'overwh24', 'unable24'];    var secondGroup = ['throw24', 'staym24', 'yell24', 'angry24'];    var firstGroupMean = 12.5740;    var firstGroupSD = 4.73907;    var secondGroupMean = 10.5049;    var secondGroupSD = 4.66062;    // Calculate sums, T-scores, and Percentiles    var firstSum = calculateSum(firstGroup);    var secondSum = calculateSum(secondGroup);    var firstTScore = calculateTScore(firstSum, firstGroupMean, firstGroupSD);    var secondTScore = calculateTScore(secondSum, secondGroupMean, secondGroupSD);    var firstPercentile = mapTscoreToPercentile(firstTScore);    var secondPercentile = mapTscoreToPercentile(secondTScore);    // Set embedded data    Qualtrics.SurveyEngine.setEmbeddedData('pstresst', firstTScore);    Qualtrics.SurveyEngine.setEmbeddedData('pstressp', firstPercentile);    Qualtrics.SurveyEngine.setEmbeddedData('angert', secondTScore);    Qualtrics.SurveyEngine.setEmbeddedData('angerp', secondPercentile);});

chackbusch · Accepted Answer

@avimintzThis code contains minor improvements and additional logging:Qualtrics.SurveyEngine.addOnReady(function() {    // Convert Likert scale responses to numerical values    function likertToNumeric(value) {        const scale = {            "Never": 1,            "Almost never": 2,            "Sometimes": 3,            "Often": 4,            "Almost always": 5        };        if (scale[value] !== undefined) {            return scale[value];        } else {            console.log("Unexpected value: " + value);            return 0; // default to 0 if value not found        }    }    // Calculate sum of responses    function calculateSum(variables) {        return variables.reduce(function(accumulator, current) {            var response = Qualtrics.SurveyEngine.getEmbeddedData(current);            console.log(current + ": " + response); // Debugging: Log each response value            return accumulator + likertToNumeric(response);        }, 0);    }    // Calculate T-score    function calculateTScore(sum, mean, sd) {        var tScore = 50 + 10 * ((sum - mean) / sd);        console.log("Calculated T-Score: " + tScore); // Debugging: Log calculated T-Score        return tScore;    }    function mapTscoreToPercentile(tScore) {        if (tScore >= 66) return 95;        if (tScore == 65) return 94;        if (tScore == 64) return 92;        if (tScore == 63) return 91;        if (tScore == 62) return 88;        if (tScore == 61) return 87;        if (tScore == 60) return 84;        if (tScore == 59) return 82;        if (tScore == 58) return 79;        if (tScore == 57) return 77;        if (tScore == 56) return 73;        if (tScore == 55) return 70;        if (tScore == 54) return 66;        if (tScore == 53) return 61;        if (tScore == 52) return 58;        if (tScore == 51) return 55;        if (tScore == 50) return 50;        if (tScore == 49) return 45;        if (tScore == 48) return 42;        if (tScore == 47) return 39;        if (tScore == 46) return 34;        if (tScore == 45) return 32;        if (tScore == 44) return 27;        if (tScore == 43) return 25;        if (tScore == 42) return 21;        if (tScore == 41) return 19;        if (tScore == 40) return 16;        if (tScore == 39) return 14;        if (tScore == 38) return 12;        if (tScore == 37) return 10;        if (tScore == 36) return 8;        if (tScore == 35) return 7;        if (tScore == 34) return 5;        if (tScore == 33) return 5;        if (tScore == 32) return 4;        if (tScore == 31) return 3;        if (tScore == 30) return 2;        if (tScore == 29) return 2;        if (tScore <= 28) return 1;    }    var firstGroup = ['stress24', 'piling24', 'overwh24', 'unable24'];    var secondGroup = ['throw24', 'staym24', 'yell24', 'angry24'];    var firstGroupMean = 12.5740;    var firstGroupSD = 4.73907;    var secondGroupMean = 10.5049;    var secondGroupSD = 4.66062;    // Calculate sums, T-scores, and Percentiles    var firstSum = calculateSum(firstGroup);    var secondSum = calculateSum(secondGroup);    console.log("First Sum: " + firstSum);  // Debugging: Log calculated sum    console.log("Second Sum: " + secondSum);  // Debugging: Log calculated sum    var firstTScore = calculateTScore(firstSum, firstGroupMean, firstGroupSD);    var secondTScore = calculateTScore(secondSum, secondGroupMean, secondGroupSD);    var firstPercentile = mapTscoreToPercentile(firstTScore);    var secondPercentile = mapTscoreToPercentile(secondTScore);    // Set embedded data    Qualtrics.SurveyEngine.setEmbeddedData('pstresst', firstTScore);    Qualtrics.SurveyEngine.setEmbeddedData('pstressp', firstPercentile);    Qualtrics.SurveyEngine.setEmbeddedData('angert', secondTScore);    Qualtrics.SurveyEngine.setEmbeddedData('angerp', secondPercentile);});BestChristian

chackbusch · Answer

@avimintzSome ideas…Ensure that the embedded data is set correctly in Qualtrics before running the code. If `Qualtrics.SurveyEngine.getEmbeddedData(current)` isn't retrieving valid responses, the calculations will be based on `0` values, leading to the same score and percentile.The `console.log` statements should help you debug. Check the browser's console to see if the values retrieved by `Qualtrics.SurveyEngine.getEmbeddedData(current)` are correct.The `likertToNumeric` function has a fallback of `0` if the value is not found in the scale. If the input values don't match exactly with the keys (`"Never"`, `"Almost never"`, etc.), the function will return `0`, causing incorrect sum calculations. Consider adding logging or checking the input values.Ensure that the variables in `firstGroup` and `secondGroup` are correctly named and that they correspond to actual embedded data fields in the survey. Typos or mismatches in variable names would result in `undefined` responses.Ensure that the survey flow logic correctly assigns values to the embedded data before this JavaScript runs. Otherwise, you might end up with default or empty values. e.g., for the emebdded data fields you try to retrieve with JavaScript:stress24, ...BRChristian

Sign up

Login to the Community

Scanning file for viruses.

This file cannot be downloaded