Оба метода помогают выбрать оптимальное количество кластеров (k), но делают это по-разному:
— Основан на
— При увеличении количества кластеров
— Нужно найти точку, в которой снижение становится
— Минус: нахождение локтя
— Для каждой точки рассчитывается
— Средняя оценка по всем точкам показывает
— Позволяет интерпретировать
— Часто даёт
— Метод локтя
— Метод силуэта — более
Библиотека собеса по Data Science
BY Библиотека собеса по Data Science | вопросы с собеседований
If riding a bucking bronco is your idea of fun, you’re going to love what the stock market has in store. Consider this past week’s ride a preview.The week’s action didn’t look like much, if you didn’t know better. The Dow Jones Industrial Average rose 213.12 points or 0.6%, while the S&P 500 advanced 0.5%, and the Nasdaq Composite ended little changed.
A spike in interest rates since the start of the year has accelerated a rotation out of high-growth technology stocks and into value stocks poised to benefit from a reopening of the economy. The Nasdaq has fallen more than 10% over the past month as the Dow has soared to record highs, with a spike in the 10-year US Treasury yield acting as the main catalyst. It recently surged to a cycle high of more than 1.60% after starting the year below 1%. But according to Jim Paulsen, the Leuthold Group's chief investment strategist, rising interest rates do not represent a long-term threat to the stock market. Paulsen expects the 10-year yield to cross 2% by the end of the year. A spike in interest rates and its impact on the stock market depends on the economic backdrop, according to Paulsen. Rising interest rates amid a strengthening economy "may prove no challenge at all for stocks," Paulsen said.
Библиотека собеса по Data Science | вопросы с собеседований from tw