where IC jh is the consumption index of product
category j (margarine) for household h ; N jh the
number of consumed units of product category j
(margarine) for household h ; CQ j the average
consumed quantity of the product category j
(margarine) for all the households of the panel.
In order to detect if consumer behaviour varies
according to this new variable, equation 2 is again
considered for each of the segments (higher
consumption than the mean and lower
consumption than the mean) and for the two
panels (national and regional). Table 7 summarises
the results.