Библиотека собеса по Data Science | вопросы с собеседований

Какие методы выборки чаще всего используются для отбора подмножества из конечной популяции

🔹 Выборка с возвращением — каждый элемент может быть выбран несколько раз.
🔹 Выборка без возвращения — элемент может быть выбран только один раз.
🔹 Стратифицированная выборка — данные делятся на группы (страты), из которых берутся случайные образцы.
🔹 Многоступенчатая выборка — отбор проводится в несколько этапов, последовательно уменьшая выборку.
🔹 Систематическая выборка — отбор элементов через равные интервалы в отсортированном списке.

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Библиотека собеса по Data Science | вопросы с собеседований Telegram | DID YOU KNOW?

In many cases, the content resembled that of the marketplaces found on the dark web, a group of hidden websites that are popular among hackers and accessed using specific anonymising software.“We have recently been witnessing a 100 per cent-plus rise in Telegram usage by cybercriminals,” said Tal Samra, cyber threat analyst at Cyberint.The rise in nefarious activity comes as users flocked to the encrypted chat app earlier this year after changes to the privacy policy of Facebook-owned rival WhatsApp prompted many to seek out alternatives.

Telegram auto-delete message, expiring invites, and more

elegram is updating its messaging app with options for auto-deleting messages, expiring invite links, and new unlimited groups, the company shared in a blog post. Much like Signal, Telegram received a burst of new users in the confusion over WhatsApp’s privacy policy and now the company is adopting features that were already part of its competitors’ apps, features which offer more security and privacy. Auto-deleting messages were already possible in Telegram’s encrypted Secret Chats, but this new update for iOS and Android adds the option to make messages disappear in any kind of chat. Auto-delete can be enabled inside of chats, and set to delete either 24 hours or seven days after messages are sent. Auto-delete won’t remove every message though; if a message was sent before the feature was turned on, it’ll stick around. Telegram’s competitors have had similar features: WhatsApp introduced a feature in 2020 and Signal has had disappearing messages since at least 2016.