What is the NAHB-Wells Fargo Housing Market Index (HMI)?
An Overview

The Housing Market Index (HMI) is based on a monthly survey of NAHB members designed to take the pulse of the single-family housing market. The survey asks respondents to rate market conditions for the sale of new homes at the present time and in the next 6 months as well as the traffic of prospective buyers of new homes. 

 

The HMI is a weighted average of separate diffusion indices for these three key single-family series. The first two series are rated on a scale of Good, Fair and Poor and the last is rated on a scale of High/Very High, Average, and Low/Very Low.  A diffusion index is calculated for each series by applying the formula “(Good-Poor+100)/2” to the present and future sales series and “(High/Very High – Low/Very Low + 100)/2” to the traffic series. Each resulting index is then seasonally adjusted and weighted to produce the HMI.

 

Based on this calculation, the HMI can range between 0 and 100.


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