Why R? Pre-meeting Amsterdam 2019 & The Cabinet of Curiosities of Jeroen Ooms

It's been a while since we got together - we have a really interesting line up for the 20th of June.

Guests from Poland are visiting us to tell us about the Why R? conference they are holding in Warsaw in September. Marcin Kosinski will tell more about it and give a talk on Segmentation with NMF decomposition.
And we have Jeroen Ooms to talk about his new package gert - a simple git client for R.

This event is hosted by Catawiki and they took care for some pizzas + beers.

Plan
18:30 - 18:35 Opening & Why R? Pre-meeting Amsterdam 2019 Intro
18:35 - 19:05 Marcin Kosinski: Segmentation with NMF decomposition
19:05 - pizza
19:35 - 20:05 Jeroen Ooms - gert - a simple git client for R
20:15 afterparty

## Segmentation using NMF decomposition ----

From the nowadays segmentation, we require them to follow below features:

• it should be balanced,
• segments should be distinctive,
• the discovered over and under indexed features within segments should create a meaningful story,
• and in the best case the amount of differentiative factors that drives segmentation should be small.

The last requirement often is a bottleneck in the scenario of a survey where respondents are asked enormous amount of questions.
The solution, one from many, to this use case can be the nonnegative matrix factorization that in a one attempt segments respondents and their features!
I'll present concept of the NMF decomposition and I'll present applications in R, with the explanation of diagnostic plots.
Working with high dimensional data? Often facing the need to group observations? That's a good presentation for you.

Speaker''s bio
Marcin Kosiński has a master degree in Mathematical Statistics and Data Analysis specialty. Challenges seeker and devoted R language enthusiast. In the past, keen on the field of large-scale online learning and various approaches to personalized news article recommendation.
Community events host: organizer of Why R? conferences.
Interested in R packages development and survival analysis models. Currently explores and improves methods for quantitative marketing analyses and global surveys at Gradient Metrics.

# Gert: a simple git client for R

The new gert package implements a simple git client for R. It is
intended to be easy to use and proivde out-of-the-box authentication
for both https and ssh remotes. We demo some of the functionality and
talk a bit about what is involved with interfacing external C
libraries from R.

URL: https://github.com/r-lib/gert

Postdoc hacker for @ropensci at UC Berkeley.