Blog Archives

Fun Data for teaching R

January 21, 2016
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Fun Data for teaching R

I’ll be running an R course soon and I am looking for fun (public) datasets to use in data manipulation and visualization. I would like to use a single dataset that has some easy variables for the first days, but … Continue reading →

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Power analysis for mixed models

October 23, 2015
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Power analysis for mixed models

This is a quick note that may be useful for some people. I was interested in knowing how many years of monitoring we need to detect a trend. This is a long term monitoring project, so we already have 7 … Continue reading →

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is_invasive( ) got a new best friend: is_native( )

May 7, 2015
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is_invasive( ) got a new best friend: is_native( )

A while ago I did a function to check if a species was among the worst invaders. I am really happy this function was used and ropensci put it in a package. However the function does not tell you if … Continue reading →

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Getting the most of mix models with random slopes

January 21, 2015
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Getting the most of mix models with random slopes

I use mix models as a way to find general patterns integrating different levels of information (i.e. the random effects). Sometimes you only want to focus on the general effects, but others the variation among levels is also of interest. … Continue reading →

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Preferring a preference index

December 17, 2014
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Preferring a preference index

I’ve been reading about preference indexes lately, specifically for characterising pollinator preferences for plants, so here is what I learnt. Preference is defined as using an item (e.g. plant) more than expected given the item abundance. First I like to use … Continue reading →

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How to update and backup a MySQL database under version control and all within Rstudio

July 21, 2014
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How to update and backup a MySQL database under version control and all within Rstudio

I am trying to have better workflows to ensure data quality and two important things for me are first, scripting as much as posible the data manipulation process, and second, backing up the database we use under version control (e.g. … Continue reading →

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On Functional Diversity metrics

April 29, 2014
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On Functional Diversity metrics

Summary: FD is getting very popular, so I figured that would be good to post not only the code (mostly borrowed) I am using: https://github.com/ibartomeus/fundiv, but also what I learnt of it. This posts assume you have read about FD calculation … Continue reading →

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About Data

April 11, 2014
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About Data

I recently did a workshop about data with PhD students. That was great to order my thoughts and put together a lot of good resources. All material used (with lots of links) is available in GitHub: https://github.com/ibartomeus/Data. Topics range from hardcore … Continue reading →

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Quick and dirty notes on General Linear Mix Models

February 24, 2014
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Quick and dirty notes on General Linear Mix Models

My datasets tend to have random factors. I try to stick to general models whenever I can to avoid dealing with both random factors and complex error distributions (not always possible). I am compiling some notes here to avoid visiting … Continue reading →

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Science at the speed of ligth

October 15, 2013
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Science at the speed of ligth

May be is not going that fast, but at the speed of R at least. And R is pretty quick. This has pros and cons. I think that understanding the drawbacks is key to maximize the good things of speed, … Continue reading →

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