StatisticsWithStataHamiltonDESCRIPTIVE STATISTICS USING EXCEL AND STATA Excel 2003 and Stata 10. If you do not see the menu on the left click here to see it. Econometrics Research Internet Resources, Online departments, conferences, preprints, journals, publishers, software, mailing lists. Kenneth L. Simons, 2Oct17 1 Useful Stata Commands for Stata versions 13 14 Kenneth L. Simons This document is updated continually. For the latest version. Books about Stata, including the latest additions to the bookstore. This section includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. Wellorganized, comprehensive list of web Statistics resources. Econometrics Beat Dave Giles Blog. Recently, I saw a reference to an interesting piece from 2. Peter Grogono, a computer scientist now retired from Concordia University. Its to do with checking the quality of a pseudo random number generator. Specifically, Peter discusses what he calls The Pickover Test. This refers to the following suggestion that he attributes to Clifford Pickover 1. Cours De Pediatrie Pdf Gratuit Telecharger. Chap. 3. 1. Pickover describes a simple but quite effective technique for testing RNGs visually. The idea is to generate random numbers in groups of three, and to use each group to plot a point in spherical coordinates. If the RNG is good, the points will form a solid sphere. If not, patterns will appear. When it is used with good RNGs, the results of the Pickover Test are rather boring it just draws spheres. Ca3U1uujsh2o2_400.jpg' alt='Statistics With Stata Hamilton' title='Statistics With Stata Hamilton' />The test is much more effective when it is used with a bad RNG, because it produces pretty pictures. Peter provides some nice examples of such pretty pictures I thought that it would be interesting to apply the Pickover Test to random numbers produced by the default RNGs for various distributions in R. Before looking at the results, note that is the support of the distribution in question is finite e. Beta distribution, then the solid sphere that is referred to in the Pickover Test will become a solid box. Similarly, if the support of the distribution is the real half line e. Chi Square distribution, the solid sphere will become a solid quarter sphere. You can find the R code that I used on the code page that goes with this blog. Specifically, I used the rgl package for the 3 D plots. Here are some of my results, in each based on a sequence of 3. Standard Normal using rnormii Uniform on 0, 1 using runifiii Binomial n 1. Poisson mean 1. Standard Logistic using rlogisvi Beta 1, 2 using rbetavii Chi Square df 5 using rchisqvii Student t df 3 using rtviii Student t df 7 using rt. Statistics With Stata Hamilton' title='Statistics With Stata Hamilton' />Onsite workshops and code examples in R popularity market share analysis of SAS, SPSS, Stata, KNIME, RapidMiner, Mathworks, Apache Spark, Python, etc. Welcome to Duxbury Data Library. To download a dataset, rightmouse click on the dataset title and save to your local directory. Why Are Serial Dilutions Used. Note that if you run my R code you can rotate the resulting 3 D plots to change the viewing aspect by holding the left mouse key and moving the mouse. You can zoom in and out by scrolling. On the whole, the results look pretty encouraging, as youd hope One possible exception is the case of the Student t distribution with relatively small degrees of freedom. Of course, the Pickover Test is nothing more than a quick visual aid that can alert you to possible problems with your RNG. Its not intended to be a substitute for more formal, and more specific, hypothesis tests for the distribution membership, independence, etc., of your random numbers. References. Adler, D., D. Murdoch, et al., 2. Pickover, C., 1. 99. Keys to Infinity. Wiley, New York. 2.