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Conjoint.ly offers a general survey tool with standard question types, randomisation blocks and multilingual support. Always free.

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Do you need support in running a pricing or product study? We can help you with agile consumer research and conjoint analysis.

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What is goodness of fit?

Also: What does it mean if my survey results display a weak fit?

Goodness of fit assesses how well your survey report describes the respondents' answers. Our platform uses McFadden’s pseudo-R² to calculate goodness of fit; if the information used to calculate your survey report could be predicted to 100% accuracy, then the pseudo-R² would be 100%.

  • Strong goodness of fit (pseudo-R² value of over 65%) indicates that respondents have clear preferences for features
  • Weak goodness of fit (pseudo-R² value of under 45%) suggests that respondents choices are more arbitrary.
A survey report with a pseudo-R² value of 80%, indicating strong goodness of fit.

This question from our users was answered on 29 November 2019. If there is anything else you'd like to know, please do not hesitate to contact us.