1243 search results for "excel"

Merging Multiple Data Frames in R

January 23, 2011
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Merging Multiple Data Frames in R

Earlier I had a problem that required merging 3 years of trade data, with about 12 csv files per year. Merging all of these data sets with pairwise left joins using the R merge statement worked (especially after correcting some errors pointed out by Ha...

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Model for nothing – and the bootstrap for free

January 21, 2011
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Model for nothing – and the bootstrap for free

Reconstructing phylogenies is an interesting task, sadly one that often requires to navigate between a multitude of software. To add an unnecessary layer of complexity to the whole thing, most of these softwares speaks different languages, and requires the user to do endless conversions from fasta to phylip to nexus to whatever new format they

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Three tips for posting good questions to R-help and Stack Overflow

January 18, 2011
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As the number of R users and contributed packages increases, activity on the R-help mailing list and the R tag on Stack Overflow also continues to rise. Users with the knowledge to help those asking questions naturally have limited time to ass...

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Three tips for posting good questions to R-help and Stack Overflow

January 18, 2011
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As the number of R users and contributed packages increases, activity on the R-help mailing list and the R tag on Stack Overflow also continues to rise. Users with the knowledge to help those asking questions naturally have limited time to ass...

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The Clipboard can be Your Friend

January 17, 2011
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The Clipboard can be Your Friend

One of the features I feel that I don’t leverage enough, particularly for ad-hoc questions, is the clipboard feature  in R. I know there are many ways to use it –  as I have been exposed to a few –  but the example below, even without context, should get you thinking about how awesome R

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R Tutorial Series: Two-Way Omnibus ANOVA

January 17, 2011
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R Tutorial Series: Two-Way Omnibus ANOVA

As with the one-way case, testing the omnibus hypothesis via two-way ANOVA is simple process in R. This tutorial will explore how R can be used to perform a two-way ANOVA to test the difference between two (or more) group means. Tutorial FilesBefore we...

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R Tutorial Series: Two-Way Omnibus ANOVA

January 17, 2011
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R Tutorial Series: Two-Way Omnibus ANOVA

As with the one-way case, testing the omnibus hypothesis via two-way ANOVA is simple process in R. This tutorial will explore how R can be used to perform a two-way ANOVA to test the difference between two (or more) group means. Tutorial FilesBefore we...

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Easiest way to start imagining four-dimensional things is by…

January 15, 2011
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Easiest way to start imagining four-dimensional things is by…

Easiest way to start imagining four-dimensional things is by numbering the corners of a 4-cube. First realize that the eight corners of a cube can be numbered “in binary” 000—001–010–100—110–101–011—111. Just like the four corners of ...

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Easiest way to start imagining four-dimensional things is by…

January 15, 2011
By
Easiest way to start imagining four-dimensional things is by…

Easiest way to start imagining four-dimensional things is by numbering the corners of a 4-cube. First realize that the eight corners of a cube can be numbered “in binary” 000—001–010–100—110–101–011—111. Just like the four corners of ...

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Remove all rows of an R dataframe

January 13, 2011
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Remove all rows of an R dataframe

I should have probably figured this out a long time ago, but as I get deeper into programming with R, I am finding the need to remove all rows from a dataframe.  I was making this alot harder than it had to be. your.df<- your.df Replace your.df with, your dataframe and you are good

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