Table 3: Cross-validated R2 and corresponding RMSE values for predicted indoor Sindoor/Soutdoor, PM2.5, and BC.

From: Development of a modeling approach to estimate indoor-to-outdoor sulfur ratios and predict indoor PM2.5 and black carbon concentrations for Eastern Massachusetts households

 R2 (unitless)RMSE (μg/m3)Intercept bias (μg/m3)Slope bias (unitless)
Indoor sulfur model0.890.038−0.021.05
Indoor PM2.5 model0.791.6950.380.90
Indoor BC model0.760.1220.011.01