The quality measures can be defined as an object (JSON) with keys 'SSE', 'MSE', 'RMSE', 'Rsquared', 'AIC', 'BIC' and 'sensitivy_analysis'. The 'sensitivity analysis' property is of type Other while the rest of properties are Double. Example: {'SSE': 0, 'MSE': 0, 'RMSE': 0, 'AIC': 0, 'BIC': 0, 'sensitivity_analysis': 'text' }