Announcing the Launch of the Mass Appraisal Modeling Masterclass Series on Substack!

Starting this Wednesday, September 23, 2026, I am kicking off a brand-new, 10-part weekly series dedicated to transforming mass appraisal practice through forensic econometric rigor.

Whether you are a CAMA modeler, chief appraiser, assessment specialist, or valuation analyst, this series provides a practical, step-by-step roadmap to building models that meet the highest technical standards.

What to Expect Across the 10 Weekly Sessions:

·        Session 1 (Launch): Representative Sales Sampling — Auditing sample integrity and P10–P90 percentile distribution stability before running a single model (the non-negotiable first step!).

·        Sessions 2–5: Regression Models — Calibrating four distinct OLS models using real county datasets, featuring dummy location coding, time adjustments, ordinal encoding, 2-pass regression, Z-score outlier trimming, and conditional variable parsimony.

·        Session 6: Sales Ratio Analysis — Comparative diagnostics evaluating initial predictive accuracy across all four models.

·        Session 7: Holdout Testing — Rigorous cross-validation on out-of-sample sales to guard against overfitting.

·        Session 8: OLS Assumption Diagnostics — Comprehensive checks for multicollinearity (VIF), homoscedasticity, non-linearity, and residual normality.

·        Session 9: IAAO Guidelines & Performance Audits — Verifying compliance using COD, PRD, PRB, and extended percentile diagnostics.

·        Session 10: Model Application & Just Value Ratio Analysis — Roll generation across the untransacted population and final assessment uniformity verification.

No Representative Test = No Model.

Achieving True BLUE Status

In this series, I will demonstrate how proper specification and multi-pass diagnostic routines allow our models to achieve Best Linear Unbiased Estimator (BLUE) status—bringing an uncompromised econometric standard that legacy CAMA software environments simply do not deliver.

Subscriptions & Charitable Mission

·  Subscription: $6/month

·  Executive Summary is always free for everyone on Substack.

·  100% Impact: All author proceeds from Substack subscriptions are donated directly to charitable organizations, including Save the Children.

· Stay tuned for the Session 1 link on Substack.