The tutorial contains the basic theoretical principles necessary for building time series models and analyzing constructed models. The required design ratios are given. Much attention is paid to the implementation of these relationships in the Excel spreadsheet processor. The tutorial contains a large number of examples and copies of fragments of Excel documents, which will allow students not only to better understand master the educational material, but also to effectively use Excel when performing coursework and thesis. The textbook is intended for bachelors studying in the areas of "Economics," "Management," as well as undergraduates and graduate students of relevant specialties.