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I'm trying to figure out whether there is a simple one or two-pass approach to randomly creating missing values for a set of existing (complete) data. For example, I want to randomly make 10% of the entries in the Iris dataset missing (i.e. NA). I don't want any case to have all missing values and I don't want any case to be missing the classification variable. I can do this in

I've tried to download the Windows 1.7.0 binary from three different mirrors today. Each time the binary comes down corrupt - MD 5 sums don't check and the installer reports that its own setup files are corrupt. Since I've tried from different computers and different connections, I have to assume a problem downstream from me. Has anyone else reported this problem? Has the binary

>selectiris<-sample(1:5, 150, replace=T) > hist(selectiris, plot=TRUE) #freq=TRUE, breaks=5, etc all do the same thing >truehist(selectiris) Is the behavior of "hist" in this sample of code correct. On my system (Windows 2K, SP2) the first and second bars are pushed together, while the 3rd, 4th, and 5th bars are correctly positioned. The function "truehist"

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...ll and staff morale with their pursuit of information leaks from their company. Can anyone spell 'Precious'? Microsoft often leaks like the proverbial and I'm talking about real insider info rather than the pre-arranged 'leaks' from the PR department to the easily impressed or gullible. Say what you like about Microsoft - and who doesn't - but the litigious company hasn't to my knowledge ever taken similar action, which shows considerable good sense and restraint. Microsoft exec's deserve some credit for that and, for once, could teach a lesson to Apple about accep...

A minor bug I've noticed: when kernel modesetting is enabled (as it is by default on most current Linux distributions), the mouse cursor lags for a few seconds when starting an application in Wine, or when a Wine'd application is doing some heavy activity. The former is not really worth mentioning, but the latter actually causes problems in a few fullscreen games I've tried, since the

Found the problem. It's polling by drm_kms_helper, as detailed here: http://souriguha.wordpress.com/2011/03/08/how-to-solve-problem-with-thinkpadkslowd-kworker-on-linux-kernel-2-35-2-36/ Putting "N" or "0" in /sys/modules/drm_kms_helper/parameters/poll, or booting with the "drm_kms_helper.poll=0" kernel parameter, fixes the issue (and a few others, e.g. kworker