【位于视频中大约20:20的位置】印度和中国对世界经济的贡献曾达到40%,不过只是在工业革命期间,现在只占到4.8%。两国合起来有20亿人口,占世界人口的1/3,产生的财富仅占世界的5%。因为他们没有顺势而变,因为统治者把他们的国民看做是农奴,而不是具有共同利益的投资人。统治者不懂得留住受过教育的人才,不刺激商业发展,不做上市,但硅谷懂得这么做,这是为什么硅谷因为懂得网罗人才而取得不断的发展,而不是像印度或中国那样单单去发展集成电路。……【阅读全文】
Author Archives: Yixf
赠太云
[文献合集]Statistics notes from The BMJ
Statistics notes from The BMJ
- Interpreting diagnostic accuracy studies for patient care
- Brackets (parentheses) in formulas
- How to obtain the P value from a confidence interval
- Comparisons within randomised groups can be very misleading
- Correlation in restricted ranges of data
- Analysis of continuous data from small samples
- Parametric v non-parametric methods for data analysis
- Missing data
- The cost of dichotomising continuous variables
- Standard deviations and standard errors
- Treatment allocation by minimisation
- Diagnostic tests 4: likelihood ratios
- The logrank test
- Interaction revisited: the difference between two estimates
- Validating scales and indexes
- Analysing controlled trials with baseline and follow up measurements
- Concealing treatment allocation in randomised trials
- Blinding in clinical trials and other studies
- …
标准差与标准误
The terms “standard error” and “standard deviation” are often confused. The contrast between these two terms reflects the important distinction between data description and inference, one that all researchers should appreciate.……【阅读全文】
[荐]一步访问谷歌
[荐]一些在线工具类的网站
- 设计
- 写作
- 生成
- 测试
欢迎朋友们予以补充!……【阅读全文】
[荐]Quickly create online and interactive plots using Plot.ly
As readers likely know putting your data online as interactive visualizations can be a lot of work. We like to use D3, Highcharts and the Google visualization API but all of these tools require some serious programming. When you’re building a website with custom data visualization the effort might make sense, but when you have data you want to share quickly and elegantly a new data visualiation tool, Plot.ly, is a nice option. You can create graphics by uploading data and manually setting plot options or you can create and upload directly from Python, R or other environments.……【阅读全文】
[荐]Beautiful plotting in R: A ggplot2 cheatsheet
Even the most experienced R users need help creating elegant graphics. The ggplot2 library is a phenomenal tool for creating graphics in R but even after many years of near-daily use we still need to refer to our Cheat Sheet. Up until now, we’ve kept these key tidbits on a local PDF. But for our own benefit (and hopefully yours) we decided to post the most useful bits of code.……【阅读全文】
[荐]数据科学家教你用数据模型来恋爱
男生和女生分别是来自不同星球的科学事实已经众所周知的了。男生们总是认为,女生们都是迷一样的生物,他们的情感状态浮动似乎是以秒单位在变化的,难以理解,更勿论预测了! 而女生们觉得男生都是没有感觉动物,完全不能理解什么叫感受——尽管已经告诉他们N次了!这种男女之间的根本差别,导致了他们之间的感情关系是受一种超级无敌复杂的系统所支配的。……【阅读全文】
[荐]An Introduction to reshape2
reshape2 is an R package written by Hadley Wickham that makes it easy to transform data between wide and long formats.……【阅读全文】