random scenarios within groups should not change

[Donato Pierno]

Dear Lioness Lab Team,

I am developing my experiment, and after the matching is done, I would like to show the subjects in the same groups the same sequence of 26 scenarios(randomly drawn from another set between 1 and 56).

After the stage lobby, I wrote this js code that works well in some online console, but the result in LIONESS is not what I would like to achieve. In the screenshot, you can see how the two subjects in group 1 receive different values for the scenarios and the paid ones as well.

Could you please help me in fixing my mistakes?

The code I use is the following:

const subjectgroup = getValue('groupNr');
 
const range = (start, stop, step) =>
    Array.from(
        { length: Math.ceil((stop - start) / step) },
        (_, i) => start + i * step,
    );

const allScenarios = range(1, 57, 1);

const imageMap = new Map(allScenarios.map(scenario => [scenario, '']));

const generateGroupScenario = () => {
    const groupScenarioSet = new Set();

    while (groupScenarioSet.size < 26) {
        const scenario = Math.floor(Math.random() * allScenarios.length);
        const scenarioValue = allScenarios[scenario];
        if (scenarioValue !== 0 && !groupScenarioSet.has(scenarioValue)) {
            groupScenarioSet.add(scenarioValue);
        }
    }

    return groupScenarioSet;
};

(() => {
    const numberOfGroups = 3;
    const groupScenarios = [];
     // Dichiarazione di subjectgroup

    for (let i = 0; i < numberOfGroups; i++) {
        const gs = generateGroupScenario();
        const scenarioArray = Array.from(gs);
        const scenario = scenarioArray.map((s, index) => ({
            group: ` ${i + 1}`,
            name: `Scenario ${index + 1}`,
            id: s,
        }));

        // Aggiungi PayedScenario
        const payedScenarioIndex = Math.floor(Math.random() * 26);
        const payedScenarioId = scenarioArray[payedScenarioIndex];
        const payedScenario = {
            group: `${i + 1}`,
            name: 'PayedScenario',
            id: payedScenarioId,
        };

        scenario.push(payedScenario);
        groupScenarios.push(scenario);
    }
    //trova l'indice dell'array che corrisponde al subjectgroup
    const groupIndex = groupScenarios.findIndex(group => parseInt(group[0].group.split(" ")[1]) === subjectgroup);

    if (groupIndex !== -1) {
        //crea le variabili scenario
        const selectedGroup = groupScenarios[groupIndex];
var Scenario1 = selectedGroup[0].id;
var Scenario2 = selectedGroup[1].id;
var Scenario3 = selectedGroup[2].id;
var Scenario4 = selectedGroup[3].id;
var Scenario5 = selectedGroup[4].id;
var Scenario6 = selectedGroup[5].id;
var Scenario7 = selectedGroup[6].id;
var Scenario8 = selectedGroup[7].id;
var Scenario9 = selectedGroup[8].id;
var Scenario10 = selectedGroup[9].id;
var Scenario11 = selectedGroup[10].id;
var Scenario12 = selectedGroup[11].id;
var Scenario13 = selectedGroup[12].id;
var Scenario14 = selectedGroup[13].id;
var Scenario15 = selectedGroup[14].id;
var Scenario16 = selectedGroup[15].id;
var Scenario17 = selectedGroup[16].id;
var Scenario18 = selectedGroup[17].id;
var Scenario19 = selectedGroup[18].id;
var Scenario20 = selectedGroup[19].id;
var Scenario21 = selectedGroup[20].id;
var Scenario22 = selectedGroup[21].id;
var Scenario23 = selectedGroup[22].id;
var Scenario24 = selectedGroup[23].id;
var Scenario25 = selectedGroup[24].id;
var Scenario26 = selectedGroup[25].id;

        //crea la variabile payedscenario
        var payedscenario = selectedGroup[26].id;
        record('Payedscenario', payedscenario);
       
record('Scenario1', Scenario1);
record('Scenario2', Scenario2);
record('Scenario3', Scenario3);
record('Scenario4', Scenario4);
record('Scenario5', Scenario5);
record('Scenario6', Scenario6);
record('Scenario7', Scenario7);
record('Scenario8', Scenario8);
record('Scenario9', Scenario9);
record('Scenario10', Scenario10);
record('Scenario11', Scenario11);
record('Scenario12', Scenario12);
record('Scenario13', Scenario13);
record('Scenario14', Scenario14);
record('Scenario15', Scenario15);
record('Scenario16', Scenario16);
record('Scenario17', Scenario17);
record('Scenario18', Scenario18);
record('Scenario19', Scenario19);
record('Scenario20', Scenario20);
record('Scenario21', Scenario21);
record('Scenario22', Scenario22);
record('Scenario23', Scenario23);
record('Scenario24', Scenario24);
record('Scenario25', Scenario25);
record('Scenario26', Scenario26);
       
       
       
       
       
        //stampa le variabili create
        console.log(`scenario1: ${Scenario1}`);
        console.log(`scenario2: ${Scenario2}`);
        console.log(`scenario3: ${Scenario3}`);
        console.log(`scenario4: ${Scenario4}`);
        console.log(`scenario5: ${Scenario5}`);
        console.log(`scenario6: ${Scenario6}`);
        console.log(`scenario7: ${Scenario7}`);
        console.log(`scenario8: ${Scenario8}`);
        console.log(`scenario9: ${Scenario9}`);
        console.log(`scenario10: ${Scenario10}`);
        console.log(`scenario11: ${Scenario11}`);
        console.log(`scenario12: ${Scenario12}`);
        console.log(`scenario13: ${Scenario13}`);
        console.log(`scenario14: ${Scenario14}`);
        console.log(`scenario15: ${Scenario15}`);
        console.log(`scenario16: ${Scenario16}`);
        console.log(`scenario17: ${Scenario17}`);
        console.log(`scenario18: ${Scenario18}`);
        console.log(`scenario19: ${Scenario19}`);
        console.log(`scenario20: ${Scenario20}`);
        console.log(`scenario21: ${Scenario21}`);
        console.log(`scenario22: ${Scenario22}`);
        console.log(`scenario23: ${Scenario23}`);
        console.log(`scenario24: ${Scenario24}`);
        console.log(`scenario25: ${Scenario25}`);
        console.log(`scenario26: ${Scenario26}`);
        console.log(`payedscenario: ${payedscenario}`);
    }

    console.log(groupScenarios);
    console.log('ciao');
})();

Thanks in advance for your help.

[in...@lioness-lab.org]

Hi Donato,

 

You could use the groupNr to set a “seed” for the JavaScript random number generation. See, e.g., https://stackoverflow.com/questions/16801687/javascript-random-ordering-with-seed

 

Alternatively, you could retrieve the relevant scenario for all group members from a single group member:

 

relevantScenario = getValue(“decisions”, “groupNr=”+groupNr + “ and subjectNr=1”, “Scenario1”) and use that.

 

NB: it might be that long series of “setValue()” commands in your code make the experiment a bit slow. You could consider saving the series of scenarios as a comma separated string in a single variable (e.g., called “Scenarios”), retrieve that based on the above procedure, and parse it using string .split(‘,’).

 

Hope this helps.

 

Cheers,

Lucas

 

PS: note that my Outlook changes apostrophe characters (from straight to curly) so copying code into LIONESS Lab may require changing the curly apostrophes to straight ones.

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