This book contains eight sections which falls several topics and arranging doors read, Part I: Classification of data and representation used, Part II: averages or central values, as well as interested dispersion measurements in section III and also addresses the Title IV-class standard in Part V: likelihood ratio and Title VI : connectivity and Title VII: sampling and measurement significance Finally comes analysis Ameli in Part VIII, and contains applications and questions in each section so as to give more room for training on processes studied by the student.