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

In this post, we will discuss about Standard Error of Regression Coefficients. The precision of an OLS estimated regression Coefficient is measured by its variance, which is proportional to $\sigma^2$, the variance of the error term in the regression model. One can quantify the precision of an Ordinary Least Squares (OLS) estimated regression coefficient by its standard error. The Standard Error: Precision of an OLS Estimated Regression Coefficient…

For this weekend only, we’re bringing back our 50%-off Charity PDF Download Event on Payhip! Whether you’re looking to master advanced va...

Beyond the Median: How to Unmask the Multi-Million Dollar Appeals Tsunami in Modern Mass Appraisal Most assessing offices still rely on th...

The traditional one-step CAMA model — a sales-based approach that directly generates Just Values across the entire Tentative Roll without further advanced algorithmic checks and balances on the popula...

Valuation Modeling: The Perfect Crossover between AVM and CAMA - Kindle edition by Som, Sid. Download it once and read it on your Kindle device, PC, phones or tablets. Use features like bookmarks, note taking and highlighting while reading Valuation Modeling: The Perfect Crossover between AVM and CAMA.

For decades, traditional mass appraisal has relied on central tendency metrics—averages and medians—as statistical shields. But evaluating a...

What if the traditional one-step CAMA approach is the root cause of the appeals tsunami? We’ve been building a better way. In Sessions 4...

Session 4B is Now Live ! Many mass appraisal systems look brilliant on paper. They boast high R^2 values, strong global F-statistics, an...

A Blueprint for Independent Consultants and Review Commissions to Diagnose Legacy CAMA Failures and Protect the Integrity of the Roll

On Wednesday at 8:00 AM, the vaults open for Session 4A: Primary Sales Calibration & Front-End Guardrails.

Post by Sid Som, MBA, MIM

Post by Sid Som, MBA, MIM

Platform-Agnostic Equalization Valuation Modeling for Assessing Staff, Review Commissions, VABs & Independent Consultants

In Session 1, we showed the foundational 2-Pass Forensic Outlier Protocol using Town-assessed properties and delivered the striking “Wake-Up Call” sample of misaligned Just Values.

Platform-Agnostic Equalization Valuation Modeling: Tools for Assessing Staff, VABs, Review Commissions & Independent Consultants

On Tuesday, we unlocked Session 1 of Platform-Agnostic Equalization Valuation Modeling, making it completely free and unrestricted for the e

New Book is Live – Valuation Modeling: The Perfect Crossover between AVM and CAMA by Sid Som on Patreon. Join Sid Som's community for exclusive content and updates.

Dear Readers,