Dataset of measurable indicators of the Slovak state institutions' websites.

The dataset contains 11 measurable indicators for the website evaluation from different points of view. These indicators were collected for 60 websites of the Slovak state institutions. It provides information about the directly measurable variables, which may affect or reflect the usability, popularity and visibility of the website. Most variables were measured by online tools. The dataset is a mixture of binary, ordinal, discrete numeric and continuous numeric variables, which gives many opportunities to analyze the relations between the measurable websites' indicators. It can be used to find the structure consisting of latent variables, which cannot be directly measured (such as usability or popularity of the website). Another use is to find subgroups of state institutions, which have similar websites from some point of view.

Wavelets and digital filters designed and synthesized in the time and frequency domains.

The relevance of the problem under study is due to the fact that the comparison is made for wavelets constructed in the time and frequency domains. The wavelets constructed in the time domain include all discrete wavelets, as well as continuous wavelets based on derivatives of the Gaussian function. This article discusses the possibility of implementing algorithms for multiscale analysis of one-dimensional and two-dimensional signals with the above-mentioned wavelets and wavelets constructed in the frequency domain. In contrast to the discrete wavelet transform (Mallat algorithm), the authors propose a multiscale analysis of images with a multiplicity of less than two in the frequency domain, that is, the scale change factor is less than 2. Despite the fact that the multiplicity of the analysis is less than 2, the signal can be represented as successive approximations, as with the use of discrete wavelet transform. Reducing the multiplicity allows you to increase the depth of decomposition, thereby increasing the accuracy of signal analysis and synthesis. At the same time, the number of decomposition levels is an order of magnitude higher compared to traditional multi-scale analysis, which is achieved by progressive scanning of the image, that is, the image is processed not by rows and columns, but by progressive scanning as a whole. The use of the fast Fourier transform reduces the conversion time by four orders of magnitude compared to direct numerical integration, and due to this, the decomposition and reconstruction time does not increase compared to the time of multiscale analysis using discrete wavelets.