Monthly Archives:January 2008

Ggobi图书网页上的新材料

January 30,2008
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The GGobi book is now available from Springer and Amazon,after quite a delay.Getting the figures printed correctly was difficult.每章后面的练习的解决方案都可以通过电子邮件发送给施普林格老师。

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锤子,还是大锤?A small study in simulation

1月29日,2008
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RKN over at Epidemiology blog had a small problem he solved using simulation:I have been interested in the following question: if there are,let's say,外汇风险责任的5个基因,每一个基因都有两个等位基因,其中一个基因与…

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Shading overlapping area of curves in R

1月28日,2008
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I was trying to plot figure in R like the one below,这基本上就是谢伯利斯的否决权参与者模式。Based on my knowledge of R now,I encountered 2 major problems:I don't know if there is a function that can draw archs,or at least partial curves from circles.I don't know if there is a good way...

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统计启发式

1月28日,2008
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统计启发式

SIMPLE WAYS TO DETECT AND COMMUNICATE STATISTICAL EFFECTSDecision Science News is fond of heuristics and the Simonian view that for many problems organisms face,优化是虚构的,满足使我们聪明。Statistics is an area in which it is easy to see precision that isn't there and find "optima" in problems that

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Hack-at-it 2007

1月28日,2008
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Hack-at-it 2007

The GGobi Hack-at-it 2007 was held just before useR!2007 in Ames Iowa.The main focus this year was on the data pipeline again,and on pipelines in other software.Several projects were discussed: the geometric shapes,high-dimensional games,local neig...

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ERGMs in R

January 23,2008
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ERGMs in R

Developers of statnet,a collection of packages for R for fitting Exponential Random Graph Models (ERGM),发布了一个重大更新。First change is that the main package is now called ergm.Secondly,a set of additional packages has been made available.Apart from package network,它为关系数据提供了一个类系统,

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Resources for S4 classes and methods

January 23,2008
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Resources for S4 classes and methods

Learning the programming in the new S4 system of classes and methods in R can be quite cumbersome,even though the methods package is very well documented.That is why I collected some of the info and materials that I am aware of on a separate page here.I warmly welcome any suggestions for extending

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GillespieSSA 0.5-1 is released

1月15日,2008
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GillespieSSA 0.5-1 is released

I just uploaded GillespieSSA 0.5-1 to CRAN.现在,它只需要几天时间就可以在所有的缝隙镜上传播。此版本主要包括我对审阅者对论文的评论所做的修订…继续阅读→

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Moving average/median

January 7,2008
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?rollmean (package=zoo)?rollmedian (package=zoo)?runmed (package=stats)

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R中的分位数回归

January 5,2008
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R中的分位数回归

Roger Koenker,a quantile regression crusader,has an R package that implements the procedure.它被称为量子,这里有记录。This package has apparently been around for quite some time,but I was only recently turned on to quantile ...

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