Monthly Archives: March 2011

Volatility Violins

March 28, 2011
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Volatility Violins

Unlike many humans, markets love change. In fact, they look forward to it with great anticipation. Regular people like stability, for the most part. Unless you're a career gypsy, you like to stay in one place for some time. Making a home. Settling in, ...

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GUIs for R

March 28, 2011
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A recent post listed at R Bloggers (https://www.r-bloggers.com/r-guis-which-one-fits-you/) made some erroneous statements about R Commander. Here is a revised description of R Commander with some issues addressed from the earlier blog:R Commander works ...

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A Lattice Panel Function for Filled Polygons that Accounts for Missing Data

March 28, 2011
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A Lattice Panel Function for Filled Polygons that Accounts for Missing Data

This is a quick update to some code posted while back, related to plotting filled polygons within a lattice panel function. After attempting to use the originally described function to plot data with NA, I quickly realized that a more robust approach w...

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R Tutorial Series: 2011 ANOVA Article Data

March 28, 2011
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R Tutorial Series: 2011 ANOVA Article Data

Having wrapped up a recent flurry of R ANOVA articles (and exhausted my knowledge of the subject), I decided to take a look at the R Tutorial Series' Google Analytics data from the past few months. Since I posted the Two-Way Omnibus ANOVA article on J...

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The devil of overfitting

March 27, 2011
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The devil of overfitting

Overfitting is a problem when trying to predict financial returns.  Perhaps you’ve heard that before.  Some simple examples should clarify what overfitting is — and may surprise you. Polynomials Let’s suppose that the true expected return over a period of time is described by a polynomial. We can easily do this in R.  The first … Continue reading...

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R-bloggers: I’m syndicated!

March 27, 2011
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Today Left Censored became a contributor to R-Bloggers. If you’ve never heard of it, R-Bloggers is a blog aggregator that brings together R-related posts from a large number of blogs across the Internet. It’s an excellent resource for those who … Continue reading →

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R [re-]exam

March 27, 2011
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R [re-]exam

In what seems like an endless cuRse, I found this week I had to re-grade a dozen R exams a TA’s did not grade properly! The grades I (X) got are plotted below against those of my TA (Y). There is little connection between both gradings… As if this was not enough trouble, I also

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R GUIs: Which one fits you?

March 27, 2011
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R GUIs: Which one fits you?

The gap of the new “digital divide” between those who only use computers when they are as easy to use as iPads and smartphones and those who like (or at least accept) to type commands to perform jobs, seems to get bigger and bigger. R – the lingua franca of statistical computing – is exactly

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R Matrix Operations

March 27, 2011
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R Matrix Operations

R can be used to perform various matrix calculations. This include functions for creating matrices (matrix), addition (+), multiplication (%*%) and inversion (solve). Fast Tube by Casper Other useful resources are provided on the Supplementary Material...

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More on Ultraedit to R

March 27, 2011
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I think I have found a superior solution to integrating Ultraedit and R. See my post over at IDM Users forum.

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