This is a book which presents several step-by-step complementary and chained
statistical tools. These tools are applied to analyse structures and variability
of natural systems helping to gradually understand and control their complexity.
The book is organised into a series of chapters which are extensively
illustrated by intuitive figures and simple numerical examples. Statistics
represent a large field of applied mathematics aiming to extract and analyse
information from sampled data issued from complex systems or populations.
Extraction of reliable information on systems requires "a priori" of the
application of strategic rules by which intrinsic variability and extrinsic
limits are considered. Such strategic rules are given by sampling designs