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. 2017 Oct 24;8:916. doi: 10.1038/s41467-017-00914-9

Fig. 4.

Fig. 4

Reporting propensity. Probability of participant sending at least one report during a 24-h period as a function of participation time and participant’s intrinsic motivation (modelled as random intercept at participant level). Main: values for the mean random intercept. Each grey curve is based on a random draw from the posterior distributions of the participation time parameters; black is based on the mean of the posteriors. Inset: prediction surface with participant motivation (random intercepts) shown on x axis as continuous variable in observed range; surface colour represents density of participants at each random intercept value (red = higher; blue = lower)