# Articles by matloff

### Use of freqparcoord for Regression Diagnostics

April 14, 2014 |

This is the third in my series of three posts on my package freqparcoord with Yingkang Xie. (My next post after this will show how to use R to explore one of my favorite examples of “what can go wrong” in statistics.) Here is a very brief review of my ... [Read more...]

### More on freqparcoord

April 6, 2014 |

In a previous post, I introduced my new package with Yingkang Xie, freqparcoord. Here I’ll illustrate some of the other uses to which the package can be applied. The freqparcoord package visualizes multivariate data by plotting the most frequent cases in the data, as defined by multivariate density estimation. ... [Read more...]

### Adding Annotation to R Objects

April 1, 2014 |

When you take a photograph, you can include the date in the image, so you remember when you created it.  (In fact, under EXIF format, it’s stored in the image file anyway, even if it doesn’t appear in the picture.)  Wouldn’t it be nice to make annotations ... [Read more...]

### The freqparcoord Package for Multivariate Visualization

March 30, 2014 |

Recently my student Yingkang Xie and I have developed freqparcoord, a novel approach to the parallel coordinates method for multivariate data visualization.  Our approach: Addresses the screen-clutter problem in parallel coordinates, by only plotting the “most typical” cases, meaning those with the highest estimated multivariate density values. This makes it ... [Read more...]

### New Blog on R, Statistics, Data Science and So On

March 30, 2014 |

Hi, Norm Matloff here. I’m a professor of computer science at UC Davis, and was a founding member of the UCD Dept. of Statistics. You may know my book, The Art of R Programming (NSP, 2011).  I have some strong views on statistics–which you are free to call analytics, ... [Read more...]
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