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Aggregate respondent part worths

POST 
/api/v1/aggregated/betas

Groups HB_Beta rows by attribute and level, then returns the mean, sample standard deviation, and respondent count for each group.

Interpretation. mean_estimate gives the average relative preference for a level. Compare levels within the same coded attribute and model.

Do not infer. Means across differently coded attributes are not directly comparable. Aggregation also hides respondent segments and should not replace inspection of the underlying distribution.

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