Weekly ZIP-level condo/co-op forecasts derived from Zillow Home Value Index histories, with ChrionML® dataset construction, quality assurance, model evaluation, and interpretation.
Brooklyn leads forecast index value; Philadelphia records lower scale-adjusted backtest error. Both selected models use Holt damped trend. Read complete Week 4 box score → · Research methods and findings →
Back Bay wins the price comparison. Hanover leads cumulative growth since January 2020 and records the lower selected-model MAE.
| Drift · selected | $2,833 |
|---|---|
| Last value | $2,898 |
| Last value · selected | $2,312 |
|---|
Source and method. Zillow publishes the underlying ZHVI histories by geography and housing type. ChrionML® manually located the condo/co-op views, compiled and quality-checked 80 monthly observations per ZIP, compared five models across 44 chronological backtests per city, and produced the forecasts and findings. Back Bay source · Hanover source. Zillow did not produce or endorse the forecasts.
Cambridge leads on forecast value and projected month-ahead momentum; Ithaca leads cumulative appreciation since January 2020.
| Drift · selected | $3,030 |
|---|---|
| Last value | $3,250 |
| Holt damped | $7,877 |
| Linear trend | $20,728 |
| Seasonal naive | $26,619 |
| Last value · selected | $1,219 |
|---|---|
| Drift | $1,491 |
| Holt damped | $2,661 |
| Seasonal naive | $6,445 |
| Linear trend | $7,662 |
Source and method. Zillow publishes the underlying ZHVI histories by geography and housing type. ChrionML® located the condo/co-op views, compiled and quality-checked the monthly datasets, compared five models, ran 44 chronological backtests per city, and produced these forecasts and findings. Cambridge source · Ithaca source. Zillow did not produce or endorse the forecasts.
Boston leads on forecast value; Providence leads projected month-ahead momentum and cumulative appreciation since January 2020.
| Drift · selected | $2,824 |
|---|---|
| Last value | $2,953 |
| Holt damped | $6,710 |
| Linear trend | $12,860 |
| Seasonal naive | $19,708 |
| Drift · selected | $1,378 |
|---|---|
| Last value | $1,818 |
| Holt damped | $3,250 |
| Linear trend | $7,474 |
| Seasonal naive | $20,511 |
Source and method. Zillow publishes the underlying ZHVI histories by geography and housing type. ChrionML® located the condo/co-op views, compiled and quality-checked the monthly datasets, compared forecasting models, ran chronological backtests, and produced these forecasts and findings. Boston source · Providence source. Zillow did not produce or endorse the forecasts.