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万分感谢10万粉丝！我现在还处在震惊中。涨粉速度太快了，10万纪念视频还没准备好，但我会尽快上传！希望你们喜欢这个视频。欢迎在评论区留下看法。再次感谢！<3 <3 <3 <3 <3 Ins: evanjolley
视频内容简介： 多数基础统计工具只适用于特定时点的问题，难以应对随时间变化的情况。而现实世界总在变化，导致许多统计模型的基本假设——尤其是独立同分布假设——不再成立。以手机使用时间为例，对同一人的多次观测往往彼此相关，这种纵向数据就会破坏“独立性”的前提。为解决这一问题，统计学家提出了广义最小二乘法（GLS），通过引入协方差矩阵来修正传统模型的缺陷，使分析更贴近现实。尤其当数据具有时间相关性时，GLS能提供更准确的参数估计与显著性判断，是处理纵向数据的重要方法。 本视频翻译自： https://www.youtube.com/watch?v=I8kcHG9Z9Jo
https://www.youtube.com/watch?v=42xvCIKkN4Y 源自油管 视频作者：Vividen: Paleontology Evolved 视频原文标题：The Megasauropods | When Nature Went Too Far 原视频简介：The megsauropods were the biggest land animals in Earth’s long and glorious history, but that’s a bit of a nebulous statement. And while elephants are certainly enormous by land mammal standards, the category “bigger than elephant” is a massive one. This video dives into the megasauropods: the biggest of the big, the sauropod dinosaurs whose largest specimens met or exceeded forty metric tonnes in overall mass. These animals were nearly immune to predation as adults, and a herd would act like an ecological earthquake as they mowed down forests and brush in their path. Their large torsos housed massive guts to permit industrial-scale fermentation of plant matter, which allowed their heads to remain small given they didn’t need to chew. Their long necks lifted their relatively tiny heads to reach plant matter that no other big herbivores could dream of reaching. In previous videos I’ve referred to this evolutionary process as a “feedback loop of gigantism,” and that’s still the best way to put it. Sauropods got big in the late Triassic, with early examples like the ten-tonne Ingentia. Success begat success, and by the Jurassic we saw real giants like the apatosaurines and diplodocines reaching over 30 meters long and weighing dozens of tonnes. Things got serious in the Cretaceous with the titanosaurs--but I won’t spoil too much. Sauropod List: https://docs.google.com/spreadsheets/d/1Wv-6O91Y900Fud1l14Yi1cpM4NvMD6txKt9pb8o5NsA/edit?gid=773248283#gid=773248283 Sauropod gigantism and biology: https://pmc.ncbi.nlm.nih.gov/articles/PMC3045712/ 如果此视频有翻译错误，可以在评论区或弹幕指正(可亦方便指正错误修改)
安史之乱是河北集团因不满关陇集团长期把持权力、反对阶级固化而掀起的叛乱，大家认同这个观点吗？
第一集，常年霸屏真题的老朋友们top100。
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2025高考数学考前最后一课【By夏老师 & drifter_飘零】
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