Using a bottom up approach, totals are aggregated from 2,490 discrete individual product group lines. Each of these lines uses specific data sources and can be analysed individually, unlike traditional studies which often group together data sources. Forecasts are calculated using the same principles as for determining market value and as such can be applied on a line by line basis. This allows the identification of high growth areas within a particular sub‐sector. Traditional methods tend to apply a growth rate to the whole of a sub‐sector, rather than individual parts of it. These differences mean that the market values shown in this report are often higher than those seen in reports using traditional analytical methods. Using this approach, each individual line can be examined and left out or added in, to allow detailed analysis of specific parts of the sector. .
