The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Solving a certain functional equation, we find all invariants of a pair of directions in n-dimensional pseudo-Euclidean geometry of index one [En1]. In (n-1)-dimensional space we construct a model for these directions by means of concepts characteristic of Euclidean geometry. Because it is a pseudo-orthogonal group, not orthogonal, that operates in this model, the distance between two points and the...
The work demonstrates that the parameter estimation of a regular two-stage hierarchical model of a time series for the seasonal data deprived of a linear trend are the same as the estimations obtained on the basis of a two-factor hierarchical model of a variance analysis, in which each of the factors of a higher order has corresponding lower-order factors of the same value. Theoretical considerations...
The article presents the findings of the use of adaptive models in forecasting a variable with seasonal fluctuations. To this end the following models were used: triparametric Holt-Winters models for original data (with seasonality) and biparametric Holt models for data free from seasonality for series of different length. During the ex post analysis of the forecast accuracy, an attempt to determine...
The papers present analisys of econometrical modelling of the daily retail sales of liquid fuel. There were analised one petrol station of the firm which plays important role on the fuel market. The variable was described by time series hierarchical models with two types of seasonal variations: weekly variations and 12 months ones. Additionally there were included feast-days and days before and after...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.