A tracking graph represents sales as a ratio of the sale price to a prior valuation. The purpose of a tracking graph is to monitor value shift trends against the previous revaluation. They indicate the degree of market movement within a sub-market group (SMG) or group of SMGs, and illustrate the consistency of the previous valuation, and/or the consistency with which market characteristics of property types are changing.

Click on the link below to go to the Valuation Best Practice and head to Page 85 for further details.

Valuation Best Practice - Tracking Graphs P85

Sales ratios are a means of comparing valuations with sales. Various statistics based on sales ratios provide measures of valuation accuracy and consistency. This section will explain the different ratio statistics, how they are calculated and interpreted, and what tolerances are applied to the statistics.

Click on the link below to go to the Valuation Best Practice and head to Page 90 for further details.

Valuation Best Practice - Sales Ratio - P90

Value shift statistics summarise the changes that have occurred between two revaluations. They are based on averages and, as such, are affected by outliers.

This section explains the calculation of value shifts, the tolerances that apply, methods for removing outliers and the outputs required for each stage.

Click on the link below to go to the Valuation Best Practice and head to Page 95 for further details.

Valuation Best Practice - Value Shift Statistics - P95