Blog Archives

FSelectorRcpp on CRAN

March 14, 2017
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FSelectorRcpp on CRAN

FSelectorRcpp - Rcpp (free of Java/Weka) implementation of FSelector entropy-based feature selection algorithms with a sparse matrix support, has finally arrived on CRAN after a year of development. It is also equipped with a parallel backend. Big th...

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3rd Birthday of Warsaw R Enthusiasts Group

March 13, 2017
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3rd Birthday of Warsaw R Enthusiasts Group

This Thursday Warsaw R Enthusiasts Group (in polish Spotkania Entuzjastów R - SER - cheese) celebrated it’s 3rd birthday! Check this post to find out what we have prepared for this special occasion. Summary of three years of the group activity ...

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Use switch() instead of ifelse() to return a NULL

February 21, 2017
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Use switch() instead of ifelse() to return a NULL

Have you ever tried to return a NULL with the ifelse() function? This function is a simple vectorized workflow for conditional statements. However, one can’t just return a NULL value as a result of this evaluation. Check a tricky workaround solution...

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Comparing (Fancy) Survival Curves with Weighted Log-rank Tests

February 9, 2017
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Comparing (Fancy) Survival Curves with Weighted Log-rank Tests

We have just adopted weighted Log-rank tests to the survminer package, thanks to survMisc::comp. What are they and why they are useful? Read this blog post to find out. I used ggthemr to make the presentation a little bit more bizarre. Log-rank statistic for 2 groups Weighted Log-rank extensions Why are they useful? ...

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How successful can an R meetup be? meet(R) in Tricity! – RSelenium and Big Data processing

February 6, 2017
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How successful can an R meetup be? meet(R) in Tricity! – RSelenium and Big Data processing

At Thursday (12.01.2017) we had a chance to attend the first TriCity R Users Group (Pomerania, Poland) meeting. The meetup was unexpectedly very successful! The success can be measured in the time attendees spent on ardently comments and questions aft...

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When You Went too Far with Survival Plots During the survminer 1st Anniversary

January 15, 2017
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When You Went too Far with Survival Plots During the survminer 1st Anniversary

We are celebrating the 1st anniversary of the survminer’s release on CRAN! Due to that fact I have prepared the most (uber platinum) customized survival plot that I could imagine. I went too far because it took over 30 parameters to create a graph.....

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Entropy Based Image Binarization with imager and FSelectorRcpp

January 8, 2017
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Entropy Based Image Binarization with imager and FSelectorRcpp

The image processing and the computer vision have gained a significant interest in last 2 decades. The image analysis can be used to detect items or people on images and videos. It is widely used in the medicine to detect cancer tissues and to improve...

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Controlling Expenses on Ali Express with RSelenium

January 8, 2017
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Controlling Expenses on Ali Express with RSelenium

Due to the incrising interest in the Internet and due to the its rising number of users, one can notice the surprising growth in the demand for analyzing data and information in the Internet that were left by users and for users. Many companies and in...

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Determine optimal cutpoints for numerical variables in survival plots

November 21, 2016
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Determine optimal cutpoints for numerical variables in survival plots

The often demand in the biostatistical research is to group patients depending on explanatory variables that are continuous. In some cases the requirement is to test overall survival of the subjects that suffer on a mutation in specific gene and have ...

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News from archivist 2.0 on eRum2016 conference

October 26, 2016
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News from archivist 2.0 on eRum2016 conference

Ten days ago eRum2016 conference (European R Users Meeting 2016) has finished. It was a huge event that attracted over 250 attenders, both from academia and business. Meeting was a great opportunity to listen to amazing keynotes like Heather Turner, K...

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