SVO Slider App

A self-contained web application for administering the Social Value Orientation Slider Measure focused on ease-of-use, scalability, information richness. Preview the app at https://svo.pdarche.vercel.app.

Features

• Full, configurable implementation of Murphy et al. 2011's semi-continuous web-based Social Value Orientation Slider Measure
• Optional, configurable pre-survey using survey.js
• Detailed event tracking providing information about the response process
• Uses Vercel and Firebase for easy deployment and data persistence without servers and at any scale

Quickstart

(Assumes you have git, node, and npm installed, and that you've created a Firebase database.)

1. Clone the repository and npm install
2. Copy the config.example.js to config.js
3. Update the FIREBASE_URL variable with the url for your Firebase instance
4. Change the INCLUDE_SURVEY variable to true to include a pre-survey and update questions in the SURVEY_JSON
5. Install the Vercel cli npm i -g vercel and configure your account
6. Deploy with now

Your instance of the app should be available at https://svo.{your_vercel_username}.now.sh and all responses will be sent to your Firebase database. You can export the data through the firebase console or through their api. If you'd like to update the app, make changes locally and redeploy with now.

Configuration

Configuration is handled in config.js

Variable	Type	Description
RESEARCHER_NAME	String	The name of the researcher responsible for the survey. Used in the About page to give respondents information about the survey
RESEARCHER_EMAIL	String	Email address for use if respondents have questions or concers
FIREBASE_URL	String	URL of the firebase instances used by the application where data will be persisted
RANDOMIZE_QUESTIONS	Boolean	Whether to randomize question ordering or present them in the order described in Murphy 2011. Defaults to true
INCLUDE_SECONDARY	Boolean	Whether to include secondary measure questions for prosocial types. Defaults to true
INCLUDE_SURVEY	Boolean	Whether to include a pre-survey. If true will default to the SURVEY_JSON bundled with the application. Defaults to false
SURVEY_JSON	Object	The json object with survey.js-style data for use in the pre-survey. See the survey.js docs for information about question types and configuration

Output

Each response yields a single json Response object with the following properties:

Attribute	Type	Description
_id	String	Unique identifier of the response / session
answers	[Answer]	Array of Answer objects containing data about individual item responses
browser	Object	Object with information about the repondent's browser
completedAt	DateTime	DateTime of when the survey was completed
events	[Event]	Array of Event objects containing data about slide and instruction events generated during the survey
ip	String	Respondent's IP address
isConsistent	Boolean	Computed measure of whether the respondent's answers were consistent given their SVO type. See Murphy 2011 for more details
otherTotal	Number	The sum of the allocation to Other
preSurvey	Object	Answers to the pre-survey, if implemented
secondaryMeasures	Object	Object with secondary measures computed for prosocial responses (if configured)
selfTotal	Number	The sum of allocations to Self
startedAt	DateTime	DateTime of when the first question began. Only applies to SVO items, not pre-survey items
svo	Number	The computed SVO angle for the response
type	String	The type corresponding to the computed SVO angle

Answer objects have the following structure:

Attribute	Type	Description
_id	String	Unique identifier of the answer
other	Number	The allocation to Other for the item
ranges	Object	Object with information about the ranges used for the item. Also contains the item number
responseTime	Number	Time in milliseconds taken to respond to the item
self	Number	The allocation to Self for the item
sessionId	String	ID of the session the answer belongs to
startedAt	DateTime	DateTime of when the question was initially presented to the respondent
submittedAt	DateTime	DateTime of when the response was submitted