Monthly Archives: October 2009

Comments on "Ecological Statistics with R"

October 8, 2009
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Comments on "Ecological Statistics with R"

Didrik Vanhoenacker has put together a site called Ecological Statistics with R.The site provides several resources useful to researchers who are new to R. It gives advice on installing R. It discusses how to use several standard techniques (ANOVA...

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Solar Trends: Comparison of TSI and GISS Temperature Anomaly Trends

October 8, 2009
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Solar Trends: Comparison of TSI and GISS Temperature Anomaly Trends

This post continues my analysis of solar trends, this time comparing reconstructed total solar irradiance (TSI) and temperature anomaly (GISS) trends for the 1880 – 2009 period. I use 11 year moving averages to smooth both series so that we can see the longer term trends.   Links to a download-able copy  of my

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“Outlook cannot open this item.” and tasks missing

October 8, 2009
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“Outlook cannot open this item.” and tasks missing

Recently Microsoft Office Outlook 2007 started giving me the vague error message Outlook cannot open this item. The item may be damaged. The message would appear randomly throughout the day. Sometimes five error message boxes would be stacked up on top of each other. OK, but which item? What kind of item? Is it an

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Delete rows from R data frame

October 8, 2009
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Delete rows from R data frame

Deleting rows from a data frame in R is easy by combining simple operations. Let’s say you are working with the built-in data set airquality and need to remove rows where the ozona is NA (also called null, blank or missing). The method is a conce...

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What ‘The power of R’ is saying

October 7, 2009
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What ‘The power of R’ is saying

Hey again,I was looking for random things at google and I found such an interesting site: www.wordle.net, were you can put lots of words or the url of a blog (like this for example) and you get a cloud with the words you put and you can change colors a...

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What ‘The power of R’ is saying

October 7, 2009
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What ‘The power of R’ is saying

Hey again,I was looking for random things at google and I found such an interesting site: www.wordle.net, were you can put lots of words or the url of a blog (like this for example) and you get a cloud with the words you put and you can change colors a...

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Factor Analysis in R

October 7, 2009
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Factor Analysis in R

This post shows an example of running a basic factor analysis in R.Additional Resources:Quick-Rpsych packageJame's Steiger's exampleFactoMineR packageThe Example:The example is based on responses by 117 university students to a 50 item version of the I...

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Efficient Variable Selection in R

October 7, 2009
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Efficient Variable Selection in R

This post sets out my procedure for efficiently and reliably selecting variables from a data.frame in RTHE PROBLEMFor years I have been tormented by the hassle of selecting variables in a data.frame. I often work with psychological datasets with hundre...

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R Commander: A Basic Statistics GUI for R

October 6, 2009
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R is a great tool with lots of resources for genetics, genome-wide association studies, and many other biological applications.  We've covered several places to find help in R in the past, but if you're still apprehensive about diving into R's command-line interface, fear not.  The R commander is a graphical user interface (GUI) for R that works under Windows,...

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Export Data Frames To Multi-worksheet Excel File

October 6, 2009
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Export Data Frames To Multi-worksheet Excel File

A few weeks ago I needed to export a number of data frames to separate worksheets in an Excel file. Although one could output csv-files from R and then import them manually or with the help of VBA into Excel, I was after a more streamlined solution, as I would need to repeat this process

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