R for Beginners: Some Simple Code to Produce Informative Graphs, Part One
A Tutorial by D. M. Wiig The R programming language has a multitude of packages that can be used to display various types of graph. For a new user looking...continue reading.
Category: Rstat
Random Forest Classification of Mushrooms
There is a plethora of classification algorithms available to people who have a bit of coding experience and a set of data. A common machine learning method is the random...continue reading.
Two meanings of priors, part I: The plausibility of models
by Angelika Stefan & Felix Schönbrodt When reading about Bayesian statistics, you regularly come across terms like “objective priors“, “prior odds”, “prior distribution”, and “normal prior”. However, it may not...continue reading.
Plot Colour Helper – Finally an easy way to pick colours for your R plots!
You’ve just made an amazing plot in R, and the only thing remaining is finding the right colours to use. Arghhh this part is never fun… You’re probably familiar with...continue reading.
An Example of Merge Layer in Keras
The power of a DNN does not only come from its depth but also come from its flexibility of accommodating complex network structures. For instance, the DNN shown below consists...continue reading.
City of Fort Collins Spending Analysis
Stoltzmaniac is going local in today’s blog post! I dug into the City of Fort Collins open data and published my findings below. The data was surprisingly clean and laid...continue reading.
Price Volatility – Basic Brownian Motion
The Situation You are a consultant who has been hired by a business that sells one commodity product. On December 31st the price is $100 per unit. The business owner...continue reading.
Estimate Regression with (Type-I) Pareto Response
The Type-I Pareto distribution has a probability function shown as below f(y; a, k) = k * (a ^ k) / (y ^ (k + 1)) In the formulation, the...continue reading.
Pregibon Test for Goodness of Link in SAS
When estimating generalized linear models for binary outcomes, we often choose the logit link function by default and seldom consider other alternatives such as probit or cloglog. The Pregibon test...continue reading.
New d3.js visualization: Equivalence, non-inferiority and superiority testing
I recently published a new explorable visualization of equivalence, and non-inferiority testing. The visualization lets you explore the decision rules associated with these different hypotheses. It also shows how the...continue reading.
Bill and Ted Make the best out of a Shi… Stata situation: Rstudio + Rstata + Stata
After rewatching the thanksgiving classic, Bill and Ted’s Excellent Adventure, it reminded me of the history of #Rstats and its current status as the defacto software for general data programming....continue reading.
More about Flexible Frequency Models
Modeling the frequency is one of the most important aspects in operational risk models. In the previous post (https://statcompute.wordpress.com/2016/05/13/more-flexible-approaches-to-model-frequency), the importance of flexible modeling approaches for both under-dispersion and over-dispersion...continue reading.
Use Rstats to Share Google Map Stars with Friends
On my trip to Japan, I took this photo of the stairs leading to the “Rucker Park of Tokyo.” I crossed up some Tokyo cats, they were garbage. That one girl...continue reading.
Modified Park Test in SAS
The severity measure in operational loss models has an empirical distribution with positive values and a long tail to the far right. To estimate regression models for severity measures with...continue reading.
How to write a useful htmlwidgets in R: tips and walk-through a real example
I’d like to share some tips and recommendations on building htmlwidgets, based on my own learning experience while creating timevis. These tips are mostly concerned with making your htmlwidget more...continue reading.
My first Shiny App: control charts
After having carefully followed the online official Shiny tutorial, I decided to make a quick try at making my very first Shiny App. I should say that I found myself...continue reading.
The X-Factors: Where 0 means 1
Hadley Wickham in a recent blog post mentioned that “Factors have a bad rap in R because they often turn up when you don’t want them.” I believe Factors are an...continue reading.
Shiny tips & tricks for improving your apps and solving common problems
This document contains a collection of various Shiny tricks that I commonly use or that I know many people ask about. Each link contains a complete functional Shiny app that...continue reading.
Five Questions about Data Science
From Safari Books Online (https://www.safaribooksonline.com/blog/2016/02/10/data-science-qa/) —Recently, we were able to ask five questions of Murtaza Haider, about the new book from IBM Press called “Getting Started with Data Science: Making Se…continue reading.
Copas Test for Overfitting in SAS
Overfitting is a concern for overly complex models. When a model suffers from the overfitting, it will tend to over-explain the model training data and can’t generalize well in the...continue reading.
