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News
July 9, 2026
HSE Economists Use Search Queries to Forecast Birth Rates
Researchers from the HSE Faculty of Economic Sciences have shown that the accuracy of birth rate forecasts for Russia can be improved by almost 50% by incorporating the dynamics of online search queries related to pregnancy and childbirth into forecasting models. In the best-performing models, the forecasting error fell from 4.6% to 3.2%. The findings have been published in Populations and Economics.
July 8, 2026
HSE Researchers Discover Who Eats Out in Russia-And Why
Around one-third of Russians (31.3%) rarely eat out or buy ready-made meals. The core group of active consumers—those who eat out or purchase prepared food almost every day or several times a week—accounts for only about 9% of the population. These are the findings of a study conducted by the HSE Institute for Social Policy. According to the researchers eating out is no longer a marker of high social status in Russia.
July 8, 2026
HSE University and RREDA Join Forces to Support 2026 Renewable Energy of the Planet Competition
HSE University and the Russia Renewable Energy Development Association (RREDA) have signed a partnership and information cooperation agreement to support Renewable Energy of the Planet—2026, a national competition with international participation for students and early-career researchers. Applications are open on the competition's website until September 20, 2026.

 

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Использовать ли показатель трудности при анализе психологических тестов?

Психологические исследования: электронный научный журнал. 2023. Т. 16. № 88. Статья 1.
Kolachev N.

The present articleis aimed to examine the applicability of the difficulty index within the framework of psychometric analysis of psychological tests. It is demonstrated that this index is often disregarded in traditional psychometric research due to its absence in the paradigm of confirmatory factor analysis, which is commonly employed by most psychologists. Analytical and empirical examples are provided to illustrate that difficulty is analogous to entropy, a measure of information quantity, and does not possess a unit of measurement.A comparison of both indices is conducted to assess their respective advantages and disadvantages. Recommendations are providedregarding their utilization in studies on the quality of diagnostic methods.

Research target: Psychology
Language: Russian
DOI
Text on another site
Keywords: entropyэнтропияпсиходиагностикаpsychodiagnosticsconfirmatory factor analysisконфирматорный факторный анализСовременная теория тестирования (IRT)Item response theoryclassical test theoryклассическая теория тестирования difficulty indexdiscriminative powerпоказатель трудностидискриминативность
Publication based on the results of:
Motivational and meaning foundations of personality success (2023)
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