search for: johannesburg

...lso like to assign the names automatically. I can create them easily using paste, but how does one get R to treat the resulting character strings as object names to which values can be assigned? Thanks! Karen --- Karen Kotschy Centre for Water in the Environment University of the Witwatersrand, Johannesburg, South Africa -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

...mple plot, I get the following: Warning message: 'length(rescale)' differs between new and previous ==> NOT changing 'rescale' (This also happens at some other times, doing other things.) Please help. Thank you. Jacob L van Wyk Department of Statistics University of Johannesburg, APK Box 524 Auckland Park 2006 South Africa Office Tel: +27 11 559 3080 Fax: +27 11 559 2832 [[alternative HTML version deleted]]

Hi Is it possible to use the rep command (or maybe some other "shortcut") to create a vector with the following format: 4 3 4 2 3 4 1 2 3 4 Any help is much appreciated. Thanks Jacob Jacob L van Wyk Department of Statistics University of Johannesburg, APK Box 524 Auckland Park 2006 South Africa Office Tel: +27 11 559 3080 Fax: +27 11 559 2832 [[alternative HTML version deleted]]

...n distribution of mean(group 1) * mean(group2). One way would be to permute 1s and 2s and select the corresponding measurements; calculate the difference in means. Redo this 1000 times, say. Etc. Any help is much appreciated. Thanks Jacob Jacob L van Wyk Department of Statistics University of Johannesburg, APK P O Box 524 Auckland Park 2006 South Africa Tel: +27 11 489 3080 Fax: +27 11 489 2832 [[alternative HTML version deleted]]

...efficiently, or elegantly (and smartly) in R, without loops etc. It is intended for first year students that are only starting to learn about statistics (or probability theory), and R of course. Thank you for your time. Regards Jacob Jacob L van Wyk Department of Statistics University of Johannesburg, APK P O Box 524 Auckland Park 2006 South Africa Tel: +27 11 489 3080 Fax: +27 11 489 2832 [[alternative HTML version deleted]]

...I am asking this because am trying to do research on banking transactions and i have around 49million records. Can R handle this? Advise with regard to this. Mark Nasila Quantitative Analyst CBS Risk Management Personal Banking 7th Floor, 2 First Place, Cnr Jeppe and Simmonds Street, Johannesburg, 2000 Tel (011) 371-2406, Fax (011) 352-9812, Cell 083 317 0118 e-mail MNasila@fnb.co.za <mailto:MNasila@fnb.co.za> www.fnb.co.za <http://www.fnb.co.za/> www.howcanwehelpyou.co.za <http://www.howcanwehelpyou.co.za/> First National Bank - a division of FirstRand Bank Limited....

...i I would appreciate if anyone could help me with an elegant solution of the following: I have a matrix that contain a small number of -Inf values. How can form a new matrix from the old one that excludes all the rows with -Inf values ? Thank you. Jacob Dept of Statistics University of Johannesburg South Africa [[alternative HTML version deleted]]

...ted model (I do not think the "usual" chi-square test is appropriate), and (2) compare the model to other models (parametric or non-parametric models). Could anyone please provide some assistance. Greatly appreciated. Thanks Jacob Jacob L van Wyk Department of Statistics University of Johannesburg, APK Box 524 Auckland Park 2006 South Africa Office Tel: +27 11 559 3080 Fax: +27 11 559 2832 [[alternative HTML version deleted]]

...oducing a "good" graph in 3d? It probably works in S-Plus, but I am using R. (I have tried plot (locfit object, type="persp") on the ethanol dataset - but this gives a poor result, with a few warnings.) THANK YOU!. Jacob Jacob L van Wyk Department of Statistics University of Johannesburg APK P O Box 524 Auckland Park 2006 South Africa Tel: +27-11-489-3080 Fax: +27-11-489-2832

...t;band_den_bin" in the base library (used for kernel density estimators). Is there a newer version of this function. I have an old routine using this but it won't run in the newer version of R. Any help is much appreciated. Jacob Jacob L van Wyk Dept of Statistics University of Johannesburg, APK Campus Box 524 Auckland Park 2006 South Africa [[alternative HTML version deleted]]

...n get a matrix that looks as follows: 0 0 0 0 30 0 0 0 0 0 0 10 0 0 0 50 I am still learning R. I think reshape will help, but it is not clear how that works here. Any help is much appreciated. Thank you. Jacob Jacob L van Wyk Department of Statistics University of Johannesburg, APK Box 524 Auckland Park 2006 South Africa Office Tel: +27 11 559 3080 Fax: +27 11 559 2832 [[alternative HTML version deleted]]

...ic, which means, as I understand it, that they relate the rank orders of the variables rather than the actual distances. Could I use these non-metric MDS packages even if my distances are metric? Thanks Karen -- Karen Kotschy Centre for Water in the Environment University of the Witwatersrand Johannesburg P/Bag X3, Wits, 2050 Tel: +2711 717-6425

...of assumptions about variances. I would lke my student to apply some regression techniques to data that fit this profile. Any help is much appreciated. (If I have not done my search more carefully - my apologies.) Thanks Jacob Jacob L van Wyk Department of Mathematics and Statistics University of Johannesburg APK P O Box 524 Auckland Park 2006 South Africa Tel: +27-11-489-3080 Fax: +27-11-489-2832

...k) csat[,1] <- factor(csat[,1], levels=c(1,2,3,4,5), labels=c("Very satisfied", "Satisfied", "Neutral", "Dissatisfied", "Very dissatisfied")) csat[,2] <- factor(csat[,2], levels=c(1,2,3), labels=c("New York", "Paris", "Johannesburg")) csat[,3] <- factor(csat[,3], levels=c(1,2,3,4), labels=c("2012-01", "2012-02", "2012-03", "2012-04")) csat.counts <- table(csat) How do I get the satisfaction scores as a percentage per store per week? It must be something simple, perhaps just...

...pt symbol ">" to, say, "R>" ? (Not just for a temporary session, but every time R command window is opened.) The documentation of doing this is rather "sparse". Much appreciated for your assistance. Jacob Jacob L van Wyk Department of Statistics University of Johannesburg, APK P O Box 524 Auckland Park 2006 South Africa Tel: +27 11 489 3080 Fax: +27 11 489 2832 [[alternative HTML version deleted]]

...t appears there is a problem with flim=c(1,6) flim is not actually correct, and consequently c(1,6) is not used correctly. I have also tried to use "xlim=c(1,6)", but without success. I need some help on this please. Thanks Jacob Jacob L van Wyk Department of Statistics University of Johannesburg APK P O Box 524 Auckland Park 2006 South Africa Tel: +27-11-489-3080 Fax: +27-11-489-2832

...uot; is causing the problem. It seems I have to set up an .Renviron file, but I am still learning R, and cannot find such a file. Would it help, and how do I create it (it that is a possible alternative to try). Thanks for any comments. Jacob Jacob L van Wyk Department of Statistics University of Johannesburg (APK) PO Box 524, Auckland Park, 2006 Office ph: 011 559 3080 Fax: 011 559 2499 ________________________________ This email and all contents are subject to the following disclaimer: http://www.uj.ac.za/UJ_email_legal_disclaimer.htm [[alternative HTML version deleted]]

...each subset showing the group, then re-join all the subsets. This seems clumsy and prone to errors. Anyone know a better way? I've looked at expand.grid and gl but they don't seem to do what I want. Thanks! Karen Kotschy Centre for Water in the Environment University of the Witwatersrand Johannesburg South Africa

...Authentication Required' I need to tell R that I need a proxy server, and give my proxy settings (how I log onto the server to connect to the Internet. My question is: Where/how do I set this? Any advice is much appreciated. Thank you. Jacob L van Wyk Department of Statistics University of Johannesburg (APK) PO Box 524, Auckland Park, 2006 Office ph: 011 559 3080 Fax: 011 559 2499 ________________________________ This email and all contents are subject to the following disclaimer: http://www.uj.ac.za/UJ_email_legal_disclaimer.htm [[alternative HTML version deleted]]

....trPaths[5], echo=TRUE, max.deparse.length=150) Error in source(.trPaths[5], echo = TRUE, max.deparse.length = 150) : object '.trPaths' not found Can somebody please help me solve this. Thank you so much for your time. Regards Jacob Jacob L van Wyk, Dept. of Statistics, University of Johannesburg (APK), Box 524, Auckland Park, 2006, South Africa Office: +27 11 559 3080, Fax: +27 11 559 2499 ________________________________ This email and all contents are subject to the following disclaimer: http://disclaimer.uj.ac.za [[alternative HTML version deleted]]