survey-likert¶

Current version: 1.1.1. See version history.

The survey-likert plugin displays a set of questions with Likert scale responses. The subject responds by selecting a radio button.

Parameters¶

In addition to the parameters available in all plugins, this plugin accepts the following parameters. Parameters with a default value of undefined must be specified. Other parameters can be left unspecified if the default value is acceptable.

Parameter	Type	Default Value	Description
questions	array	undefined	An array of objects, each object represents a question that appears on the screen. Each object contains a prompt, labels and required parameter that will be applied to the question. See examples below for further clarification.`prompt`: Type string, default value is undefined. The strings are the question that will be associated with a slider. `labels`: Type array, default value is undefined. Each array element is an array of strings. The innermost arrays contain a set of labels to display for an individual question. If you want to use blank responses and only label the end points or some subset of the options, just insert a blank string for the unlabeled responses.`required`: Type boolean, default value is false. Makes answering questions required. `name`: Name of the question. Used for storing data. If left undefined then default names (`Q0`, `Q1`, `...`) will be used for the questions.
randomize_question_order	boolean	`false`	If true, the display order of `questions` is randomly determined at the start of the trial. In the data object, `Q0` will still refer to the first question in the array, regardless of where it was presented visually.
preamble	string	empty string	HTML formatted string to display at the top of the page above all the questions.
scale_width	numeric	null	The width of the likert scale in pixels. If left `null`, then the width of the scale will be equal to the width of the widest content on the page.
button_label	string	'Continue'	Label of the button.
autocomplete	boolean	false	This determines whether or not all of the input elements on the page should allow autocomplete. Setting this to true will enable autocomplete or auto-fill for the form.

Data Generated¶

In addition to the default data collected by all plugins, this plugin collects the following data for each trial.

Name	Type	Value
response	object	An object containing the response for each question. The object will have a separate key (variable) for each question, with the first question in the trial being recorded in `Q0`, the second in `Q1`, and so on. The responses are recorded as integers, representing the position selected on the likert scale for that question. If the `name` parameter is defined for the question, then the response object will use the value of `name` as the key for each question. This will be encoded as a JSON string when data is saved using the `.json()` or `.csv()` functions.
rt	numeric	The response time in milliseconds for the subject to make a response. The time is measured from when the questions first appear on the screen until the subject's response(s) are submitted.
question_order	array	An array with the order of questions. For example `[2,0,1]` would indicate that the first question was `trial.questions[2]` (the third item in the `questions` parameter), the second question was `trial.questions[0]`, and the final question was `trial.questions[1]`. This will be encoded as a JSON string when data is saved using the `.json()` or `.csv()` functions.

Install¶

Using the CDN-hosted JavaScript file:

<script src="https://unpkg.com/@jspsych/plugin-survey-likert@1.1.1"></script>

Using the JavaScript file downloaded from a GitHub release dist archive:

<script src="jspsych/plugin-survey-likert.js"></script>

Using NPM:

npm install @jspsych/plugin-survey-likert

import surveyLikert from '@jspsych/plugin-survey-likert';

Examples¶

Single Question

CodeDemo

var trial = {
  type: jsPsychSurveyLikert,
  questions: [
    {
      prompt: "I like vegetables.", 
      labels: [
        "Strongly Disagree", 
        "Disagree", 
        "Neutral", 
        "Agree", 
        "Strongly Agree"
      ]
    }
  ]
};

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Multiple questions in a random order

CodeDemo

var likert_scale = [
  "Strongly Disagree", 
  "Disagree", 
  "Neutral", 
  "Agree", 
  "Strongly Agree"
];

var trial = {
  type: jsPsychSurveyLikert,
  questions: [
    {prompt: "I like vegetables.", name: 'Vegetables', labels: likert_scale},
    {prompt: "I like fruit.", name: 'Fruit', labels: likert_scale},
    {prompt: "I like meat.", name: 'Meat', labels: likert_scale},
  ],
  randomize_question_order: true
};

Open demo in new tab