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Many game development companies use game data analysis for mining insights about users' behaviour and possible product growth. One of the most important analysis tasks for game development is user churn prediction. Effective churn prediction can help hold users in the game by initiating additional actions for their engagement. We focused on high-value user churn prediction as it is of particular interest for any business to keep paying customers satisfied and engaged. We consider the churn prediction problem as a classification problem and conduct the random undersampling approach to address imbalanced class distribution between churners and active users. Based on our real-life data from a freemium casual mobile game, although the best model was chosen as the final classification algorithm for extracted data, we can definitely say there is no general solution to the stated problem. Model performance highly depends on the churn definition, user segmentation and feature engineering, it is therefore necessary to have a custom approach to churn analysis in each specific case.

The article deals with a contemporary debate on Hippocratic ethics. Both the opponents and proponents of Hippocratic medical ethics seem to ignore the complexity of the said ethical system. The ethics of the Corpus Hippocraticum can be properly understood only in relation to physiological, psychological, and other factors. Therefore, the ongoing debate only partially represents ethical issues, and a number of arguments in it cannot be considered as valid. Moreover, the complexity of Hippocratic ethics reveals that quite a few of its principles are still valid today and deserve to be further analyzed. In addition, some of its principles have been incontestably incorporated into contemporary medical ethics.

The strategies and tactics of the Lithuanian women's movement helped to change the attitudes of society, political parties, altered political, educational and legal systems and expanded the field of relevant issues on the international level. However, the state's existence period (1918–1940) was too short for women to be able to fully realise them; thus, most of the formed strategies are relevant today and are realised. The examples of strategy implementation ways show that women's actions were important for the society and the state and had direct impact on their development. The second strategic period is very important; during this period, Lithuanian women were granted political rights. Novelty of work. The article provides the correct date of women being granted suffrage based on historical sources, i.e., 20 November 1919, the law on election of the Constituent Assembly of Lithuania. It does not coincide with the notion established in the Lithuanian historiography that the date is 2 November 1918. The author proves that this error emerged due to incorrect interpretation of the article in the 2 November 1918 Lithuanian Temporary Constitution on the person's (citizen's) rights. Moreover, the researcher takes on a new approach towards the Lithuanian women's movement through the prism of implementation of strategies and tactics. This approach towards the history of the Lithuanian women's movement is new. The methods of descriptive, analytical and comparative research. The sources studied are: historical sources, including state documents, archival materials, monographs, survey studies, biographical studies, memoirs, private letters, press, etc.

Totalitarian states control information space, watching closely the appearance of only that information that does not contradict an official one. In this way, on the one hand, "classical archival" sources had been preserved, with content controlled by the totalitarian regime. On the other hand, ignored and repressed society members who had been persecuted or committed crimes against humanity remain unheard. Taking into account often liquidation by the dictators not only direct witnesses of their crimes, but also indirect ones (documents), it turned out that it is oral history is often the only proof able to be used in a court against the guilty in genocide. Mostly documents of local level have been preserved after archivocide in the Ukrainian archives of the party organs. These sources contain facts mostly «allowed» by the party. «Unallowed» facts as part of Holodomor history have to be searched for first of all in oral history. The goal of the research is to review some thematic aspects of Holodomor from the pint of view of their correlation in archival sources and oral history. Because of intentional liquidation of the sources of the Holodomor epoch (1930s), we do not have many facts from specialists in agriculture, medicine, education. Such facts, as well as a set of others, often absent or partly present in archival sources, can be found in oral history. Therefore, present in archival sources about the famine spots are often covered by oral history testimonies. Besides, sources of personal origin suggest vision from «below», often correlating with information blocks of archival sources: level of mortality, expressed in description of amount of corpses on the streets; methods of food confiscation; fate of kids; escape from a village as a survival strategy; black boards. Such parallel reading allows «revealing» of the sources produced by the Soviet totalitarian state.