DOE Articles
A scatter diagram is an extremely simple statistical tool used to show a relationship between two variables. It is often combined with a simple linear regression line used to fit a model between the two variables. To illustrate this, I collected some data on a recent trip to the La Brea Tar Pits. The La […]
Scatter Plots and Simple Linear Regression Read More »
My previous article analyzing the performance of Barry Bonds and Roger Clemens has spurred quite a controversy. In the article, the statistics show that Roger Clemens’ performance was not statistically improved during the alleged performance-enhancing drug years. I often get comments from baseball fans; many of them are not swayed by the data. They are “convinced” of
Mixed response modeling is a mouthful but a very simple concept. Outputs (responses) can be either Quantitative, Binary, or Nominal. Each of these types of outputs should be handled differently in regression. Specifically… Quantitative outputs are modeled with Ordinary Least Squares Regression (OLS) Binary outputs are modeled with Binary Logistic Regression Nominal outputs are modeled
Mixed Response Modeling and Optimization with Quantum XL 2013 Read More »
Categorical Predictor Variables in Design of Experiments (DOE) by Philip Mayfield Inputs to designed experiments can fall into two general broad categories: Quantitative and Categorical (Qualitative). Quantitative inputs have scale or a direction measurement such as temperature and pressure. Categorical variables do not have scale – examples include vendor, day of week, and color. It
Categorical Predictor Variables in Design of Experiments (DOE) Read More »