Floor area and sale price
Sale prices against floor area, on a market that includes 700-square-foot starters and 4,500-square-foot custom builds. The mean rises with size, and so does the spread. A 4,000-sqft house has a lot more room to be cheap or expensive than a 700-sqft one does. A straight line can only report the slope.
Penalized splines fit by REML in Rust, compiled to WASM and loaded on demand. Switching family or dataset refits in the tab; there is no model server behind this. -> glissando
-- A line averages a market that scatters very differently at each scale, so it sits off the data at the small end and off it again at the large end.
⌇ Normal GAM bends to the mean, but holds spread constant across the whole market. The gray band is the same width at 800 sqft as it is at 4,000.
◈ Gamma GAMLSS lets the spread ride along with the mean. The orange band fans out at the high end where prices vary a lot, and tightens at the low end where they don't.