Analytical chemists have long used statistical methods to help them

organize and interpret experimental data, especially where large

numbers of these are generated, as well as to help them design

new experiments. Recently chemometrics has found applications in

wider fields, such as the determination of the geographical origin

of food and other products. During the past several years, we have

carried out a systematic study of the factors affecting the pore struc-

ture and surface chemistry of cerium oxide and of mixed oxides

of cerium with various transition metal or alkaline earth metal