求教大家关于R软件的

阿尔瓦雷斯

R软件很难学吗 本人没编程背景 刚接了一个project 要学R统计软件 大家有什么自学窍门吗

猪之哥

你可能需要先告诉别人具体是用R做些什么分析。

阿尔瓦雷斯

I am attaching 3 files here:  the input CSV file which we discussed today, the R code, and the PPT containing the variable distributions in the original population.  It would be great if the script could be set up such that the user inputs the following:



(1)    Range of acceptable values for each variable in each level (in our example, there are 8 levels)

(2)    # of samples we want to select from each level (in this case, 13)

(3)    The CSV file



And the script will produce as outputs:

(1)    The seed that produced the final set of 13 samples for each level

(2)    The list of selected sample IDs (in this case, 13) for each level.  In this case, the sample IDs are the ‘Sitesubj’ variable in the CSV file.

(3)    lots and tables showing the final variable values (all scaled in %) for each level



Something else I forgot to mention, which might be of help is that you can set the y-axis range for the boxplots using the command:  

boxplot(s1$AGE, ylim=c(10,77))



This helps when comparing the original boxplot to the sample boxplot, since you can set their y-axes to be the same.



Also, you had asked about the continuous variables (what to use for range).  I should have asked if you were familiar with boxplots, but here is a brief reference:



http://www.childrensmercy.org/stats/definitions/boxplot.htm



There are 5 numbers that comprise a boxplot—so you could pick some of them to use for setting your ranges.  I would suggest trying the median, mean, and box length, since these are the most important components

阿尔瓦雷斯

你可能需要先告诉别人具体是用R做些什么分析。

-- by 会员 猪之哥 (2012/5/12 6:24:30)

嗯 我把问题贴出来了 谢谢 我一点头绪都没有 教授让我先学R

摇一摇

去看一些Statistics的课，比如UC－Berkeley的公开课，就有教R的。

可以问问你教授，直接Stata或者SAS不行么？R学会了，如果不用也会忘掉的吧？

judydongxueni

有教stata的公开课么？

阿尔瓦雷斯

去看一些Statistics的课，比如UC－Berkeley的公开课，就有教R的。

可以问问你教授，直接Stata或者SAS不行么？R学会了，如果不用也会忘掉的吧？

-- by 会员 摇一摇 (2012/5/12 9:35:49)

                   

不懂哎 这是一个医药公司的活 那人说要用R给他做 教授就让我自己学R 我都不知道从哪入手......

BeBrave2011

我以前学R的时候很喜欢的网站：
http://www.statmethods.net/
我觉得这个比R的官方网站清楚，上手快。

piner

thanks for sharing

BeBrave2011

I am attaching 3 files here:  the input CSV file which we discussed today, the R code, and the PPT containing the variable distributions in the original population.  It would be great if the script could be set up such that the user inputs the following:



(1)    Range of acceptable values for each variable in each level (in our example, there are 8 levels)

(2)    # of samples we want to select from each level (in this case, 13)

(3)    The CSV file
这部分可见：http://www.statmethods.net/input/importingdata.html



And the script will produce as outputs:

(1)    The seed that produced the final set of 13 samples for each level

(2)    The list of selected sample IDs (in this case, 13) for each level.  In this case, the sample IDs are the ‘Sitesubj’ variable in the CSV file.

(3)    lots and tables showing the final variable values (all scaled in %) for each level
这部分可见：http://www.statmethods.net/management/index.html
http://www.statmethods.net/graphs/index.html



Something else I forgot to mention, which might be of help is that you can set the y-axis range for the boxplots using the command:  

boxplot(s1$AGE, ylim=c(10,77))



This helps when comparing the original boxplot to the sample boxplot, since you can set their y-axes to be the same.



Also, you had asked about the continuous variables (what to use for range).  I should have asked if you were familiar with boxplots, but here is a brief reference:



http://www.childrensmercy.org/stats/definitions/boxplot.htm



There are 5 numbers that comprise a boxplot—so you could pick some of them to use for setting your ranges.  I would suggest trying the median, mean, and box length, since these are the most important components

-- by 会员 阿尔瓦雷斯 (2012/5/12 6:29:00)