search for: galton

I'm trying to do a sunflowerplot of Galton's data, with both regression lines and data ellipses, and I must be doing something wrong, because the lines do not intersect at \bar{x}, \bar{y}. The problem is likely in the line for x.y, but I don't know how to specify that correctly. The data is read in grouped form( galton), and th...

I'm sure this is probably simple, but I can't find an answer... I have a data frame (Galton's data on heights of parents and children), in grouped form, parent child frequency 73.5 72.2 1 73.5 73.2 3 72.5 68.2 1 72.5 69.2 2 72.5 70.2 1 72.5 71.2 2 72.5 72.2 7 72.5 73.2 2 72.5 74.2 4 71.5 65.2 1 71.5 66.2 3 71.5 67.2 4 71.5 68.2 3 71.5 69.2 5 71.5 70.2 10 ... and need the ungrouped...

Faraway's book titled "Practical Regression and Anova using R", with full text available online at: http://cran.r-project.org/doc/contrib/Faraway-PRA.pdf refers to a data set, stat500, which compares midterm and final grades. It can be used to illustrate similar concepts. A google search for faraway.zip will locate the actual data. --- Date: Sun, 15 Feb 2004 10:37:08 -0800

Newbie question (just joined the list) Is anyone running Ruby on Rails in a teaching environment? Regards John John Colby BA, MBCS, PGCertE Lecturer, Department of Computing, The Business School Room F316, Galton Building, University of Central England, Franchise Street, Perry Barr, Birmingham B42 2SU Tel: +44 (0) 121 331 6937, Fax +44 (0) 121 331 6281, Mobile: 07795 215 912 Essential Website - http://essential.tbs.uce.ac.uk -------------- next part -------------- An HTML attachment was scrubbed... U...

...--------------------------------------------+ | Tom Backer Johnsen, Psychometrics Unit, Faculty of Psychology | | University of Bergen, Christies gt. 12, N-5015 Bergen, NORWAY | | Tel : +47-5558-9185 Fax : +47-5558-9879 | | Email : backer at psych.uib.no URL : http://www.galton.uib.no/ | +----------------------------------------------------------------+

...od answer! I'm interested in the provenance of the name "normal distribution" (for what I'd really prefer to call the "Gaussian" distribution). According to Wikipedia, "The name "normal distribution" was coined independently by Charles S. Peirce, Francis Galton and Wilhelm Lexis around 1875." So be it, if that was the case -- but I would like to know why they chose the name "normal": what did they intend to convey? As background: I'm reflecting a bit on the usage in statistics of "everyday language" as techincal terms, as in...

...ally want) Thomas -----Urspr?ngliche Nachricht----- Von: Michael Friendly [mailto:friendly at yorku.ca] Gesendet: Do 25.09.2003 19:14 An: r-help Cc: Betreff: [R] ungrouping grouped data I'm sure this is probably simple, but I can't find an answer... I have a data frame (Galton's data on heights of parents and children), in grouped form, parent child frequency 73.5 72.2 1 73.5 73.2 3 72.5 68.2 1 72.5 69.2 2 72.5 70.2 1 72.5 71.2 2 72.5 72.2 7 72.5 73.2 2 72.5 74.2 4 71.5 65.2 1 71.5 66.2 3 71.5 67.2 4 71.5 68.2 3 71.5 69.2 5 71.5 70.2 10 ... and...

...--------------------------------------------+ | Tom Backer Johnsen, Psychometrics Unit, Faculty of Psychology | | University of Bergen, Christies gt. 12, N-5015 Bergen, NORWAY | | Tel : +47-5558-9185 Fax : +47-5558-9879 | | Email : backer at psych.uib.no URL : http://www.galton.uib.no/ | +----------------------------------------------------------------+

...--------------------------------------------+ | Tom Backer Johnsen, Psychometrics Unit, Faculty of Psychology | | University of Bergen, Christies gt. 12, N-5015 Bergen, NORWAY | | Tel : +47-5558-9185 Fax : +47-5558-9879 | | Email : backer at psych.uib.no URL : http://www.galton.uib.no/ | +----------------------------------------------------------------+

...--------------------------------------------+ | Tom Backer Johnsen, Psychometrics Unit, Faculty of Psychology | | University of Bergen, Christies gt. 12, N-5015 Bergen, NORWAY | | Tel : +47-5558-9185 Fax : +47-5558-9879 | | Email : backer at psych.uib.no URL : http://www.galton.uib.no/ | +----------------------------------------------------------------+

...mcol <- 2 xy <- expand.grid(xpoints, ypoints) xx <- seq(1, 25, 2) yy <- rep(0, 25) ypos <- ypoints + 0.4 HT <- c("H", "T") for(j in 1:trials) { plot(xpoints, ypoints, type = "n", xlab = "", ylab = "", axes = F, main = "Galton's Quincunx") points(x = xy[, 1], y = xy[, 2], pch = 5, col = 1) marble.path <- sample(HT, 25, replace = T) xpos <- 13 points(xpos, ypos[25], pch = 16, col = 8) for(i in 1:24) { if(marble.path[i] == "H") xpos <- xpos + 1 else xpos <- xpos - 1 if(...

Could anyone tell me where can I find some examples of the applications to economics of a Markov chain? Many thanks in advance. Luis Rivera. -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not

> Dear useRs, > > by a circular diagram representation I mean what you will get by entering > this at your R promt: > > pie(1:5) > > Nice to have R as a lingua franca :-) > > The folowing quote is from page 360 in this very interesting paper: > > @article{SpenceI2005, > title = {No Humble Pie: The Origins and Usage of a Statistical Chart}, >

Me and some colleagues are planning to write a textbook together ("Statistics using R") where the target audience for the book is psychologists and students of psychology. We thought that it might be a good idea to use a Wiki when writing the text. Is that a good idea? Does anybody have any experience in that direction? What alternatives are there? The tool (Wiki) would have to be

< Does anyone know why they're called random deviates, as opposed to random numbers?> Others will probably give you some technical reason about random numbers can be considered as random deviates from a mean (I think at least the 1875 Galton paper at http://www.mugu.com/galton/ uses similar terminology (I'm not claiming this is the earliest use - just the easiest to access at the moment)). But everyone knows the real reason for the term is to create the oxymoron 'normal deviates' - it's a great name for a softball team...

Hello, I have a problem with the sizes of points on the screen (Code tested for some R versions on a Solaris system and also for Linux). Maybe it is best to start with an example: If I do a very simple plot using the character '.' for the points, e.g., n<-100; plot(0:n,0:n,pch='.',cex=1+(0:n)/20) then not all for all the points the horizontal and vertical dimensions are the

...--------------------------------------------+ | Tom Backer Johnsen, Psychometrics Unit, Faculty of Psychology | | University of Bergen, Christies gt. 12, N-5015 Bergen, NORWAY | | Tel : +47-5558-9185 Fax : +47-5558-9879 | | Email : backer at psych.uib.no URL : http://www.galton.uib.no/ | +----------------------------------------------------------------+

...--------------------------------------------+ | Tom Backer Johnsen, Psychometrics Unit, Faculty of Psychology | | University of Bergen, Christies gt. 12, N-5015 Bergen, NORWAY | | Tel : +47-5558-9185 Fax : +47-5558-9879 | | Email : backer at psych.uib.no URL : http://www.galton.uib.no/ | +----------------------------------------------------------------+

...to cold-blooded verification. But it is the triumph of scientific men to rise superior to such superstitions, to devise tests by which the value of beliefs may be ascertained, and to feel sufficiently masters of themselves to discard contemptuously whatever may be found untrue." --Sir Francis Galton, FRS [[alternative HTML version deleted]]

Gentlepersons: A long time ago I used to be able to start R (version 2.6.1) from a Delphi 7 program and run a script by using a procedure like the following: function StartRAndWait (CommandLine : string) : Boolean; var Proc_info: TProcessInformation; Startinfo: TStartupInfo; ExitCode: longword; CreateOK : Boolean; begin Result := False; { Initialize the structures }