Monthly Archives:2013年3月

p-values are (possibly biased) estimates of the probability that the null hypothesis is true

3月31日,2013
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p-values are (possibly biased) estimates of the probability that the null hypothesis is true

上周,I posted 金宝搏网址about statisticians' constant battle against the belief that the p-value associated (for example) with a regression coefficient is equal to the probability that the null hypothesis is true,for a null hypothesis that beta is zero or negative.I argued that (despite our long pedagogical practice) there are,in fact,many

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绘制它们是我真正的考验

3月31日,2013
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绘制它们是我真正的考验

我几乎没法把这个贴出来,但现在是愚人节,so I'll never have a better opportunity.This Gist shows how to scrape "stats" and .PNG images from,ERMBulbapedia,在这些“统计数据”上做一个简单的降维,并绘制出所有151个原始口袋妖怪。我对口袋妖怪不太了解,金宝搏网址so I can't vouch for the utility of...

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R和最后一个逗号

3月31日,2013
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In R,every comma matters.When creating a vector,c(1,2,5)会做正确的事,but add one unfortunate comma and c(1,2,5,)将以C(1,2,5,) : argument 4 is empty.Other languages like Perl are less strict when defining basic data structures: having a comma after...

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How do Dew and Fog Form?Nature at Work with Temperature,Vapour Pressure,and Partial Pressure

3月31日,2013
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How do Dew and Fog Form?Nature at Work with Temperature,Vapour Pressure,and Partial Pressure

In the early morning,especially here in Canada,我经常看到露水——由水蒸气凝结在外表面形成的水滴,like windows,car roofs,and leaves of trees.I also sometimes see fog – water droplets or ice crystals that are suspended in air and often blocking visibility at great

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Gary King和Stuart Shieber开放访问

3月31日,2013
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Harvard Professors Gary King and Stuart Shieber provide advice to graduate students 金宝搏网址about open access,dissertations,and journal publishing.They explain how freely available publications are essential to the scientific community,but also benefit your own career.金建议一个聪明的方法处理出版商版权协议,以防止锁定你的作品背后…

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用分位数范围和标准偏差检查正态性

3月31日,2013
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用分位数范围和标准偏差检查正态性

Introduction I was reading Michael Trosset's "An Introduction to Statistical Inference and Its Applications with R",我学到了一个基本但有趣的事实,关于正态分布的四分位间距和标准差,我以前没有学过。金宝搏网址This turns out to be a good way to check for normality in a data set.

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Easter

3月31日,2013
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Easter

This morning,there was an interesting post entitled "why does Easter move around so much?" online on http://economist.com/blogs/economist-explains/… In my time series classes,I keep saying that sometimes,系列可以表现出季节性,but the seasonal effect can be quite irregular.它是河流水位的CA,where snowmelt can have a huge impact,而且是不规则的。Similarly,巧克力销售…

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R function to retrieve pubmed citations from pmid number

March 30,2013
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如果您有数百个pmid,并且需要来自pubmed/medline引用的特定字段,那么这个数字很有用。

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将数据导入R

March 30,2013
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There are number of ways in importing data into R,and several formats are available,From Excel to R From SPSS to RFrom Stata to R,在这篇文章中,我将讨论导入我们经常遇到的通用数据格金宝搏网址式,such as Excel,...

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RSAGA:开始

March 30,2013
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RSAGA provides access to geocomputation capabilities of SAGA GIS from within R environment.Having SAGA GIS installed is a (quite obvious) pre-requirement to use RSAGA. In Linux x64 sometimes additional preparations are needed.In Linux SAGA as we...

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