similar to: has_many :through with has_many/has_many join models

I have an app with the following models: course belongs_to :semester semester has_many: courses belongs_to :education education has_many :semesters In my old app (rails 1.2.6) I was able to access variables via controller @courses = Course.find(:all) view file: <% for course in @courses %> <%= course.name %> <- this line works <%= course.semester.name %> <- this is now

Read R-helpers, I'm relatively new to R and trying to jump in feet first. I've been able to learn a lot from on-line and printed documentation, but here's one question to which I can't find an answer. Well, it's a question with a couple parts. Thanks in advance for any direction (partial or complete) that anyone can provide. I have a data frame with three columns:

Dear R-helpers, New to R, I'm in the middle of a project that I'm using to force me learn R. I'm running into some behavior that I don't understand, and I need some advice. In the last week I've gotten some great advice from the list on visualizing my data, and I was hoping people could help me get over another barrier I've encountered to my progress. Before I

I have a data frame that has columns Semester, Student ID (SID), Subject, Grade, Devel (Tor F). Students can have multiple records within a semester. Right now, the columns are not considered factors. I want to do an analysis that would show the number of students who received particular combinations of grades. I also need to distinguish between the two Development levels (they modify classes,

Dear colleagues, particularly academic ones, So I'm creating a Microsoft Word template for myself so that every time I teach a new course, I don't have to enter in the dates manually for each class session. I'd like to use an R script that can generate an irregular series of dates starting from one date (semester begin) to another (semester end) using an irregular interval in

Dear R People: Are your undergraduate students receptive to learning R, as a rule? Most of the time, mine really like it. But this semester, they act as though they are being eaten by rats when learning R. They are not trying at all. Any similar experiences? If anyone has any good ideas, I would be THRILLED to hear them, as I am using R in Summer School. Thanks, Sincerely, Erin Hodgess

Hi R People! I'm going to be putting together a completely online undergrad business stats course (a second semester course) and was going to use R and Rcmdr. My question: has anyone else used R for an online course, please? If so, did it go well, please? Thanks in advance, Sincerely, Erin -- Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University

Greetings, everybody. Can I ask some glm questions? 1. How do you find out -2*lnL(saturated model)? In the output from glm, I find: Null deviance: which I think is -2[lnL(null) - lnL(saturated)] Residual deviance: -2[lnL(fitted) - lnL(saturated)] The Null model is the one that includes the constant only (plus offset if specified). Right? I can use the Null and Residual deviance to

Help ! I am a graduate student in statistics, nearing the end of my first semester, and recently discovered R, but cannot figure out how to install it on my Mac. I am currently running OS 10.1.1, and know next to nothing about Unix or anything related. I would like to install this program on my Powerbook, as it come highly recommended, so I can use it for a class next semester. Any help

Hi All, I'm taking an Experimental Design course this semester, and have spent many long hours trying to coax the professor's SAS examples into something that will work in R (I'd prefer that the things I learn not be tied to a license). It's been a long semester in that regard. One thing that has really frustrated me is that lme has an extremely counterintuitive way for

IPSUR-1.0 is making its way through CRAN. It is a snapshot of the development version of the following textbook: Title: Introduction to Probability and Statistics using R, First Edition ISBN: 978-0-557-24979-4 Publisher: me The book is targeted for an undergraduate course in probability and statistics. The prerequisites are a couple semesters of calculus and a little bit of linear algebra. I

IPSUR-1.0 is making its way through CRAN. It is a snapshot of the development version of the following textbook: Title: Introduction to Probability and Statistics using R, First Edition ISBN: 978-0-557-24979-4 Publisher: me The book is targeted for an undergraduate course in probability and statistics. The prerequisites are a couple semesters of calculus and a little bit of linear algebra. I

Hi all, we got a very difficult browsing problem here at the college of German Telecom at Dieburg. We have been trying to get browsing working at our student quarters for about three semesters now, re-reading the BROWSING.TXT file for XX times and spending YY hours analysing nmbd's log files. I hope somebody can point us to the right direction or tell us where to find more information about

Martyn Plummer writes: > How important is it to avoid being sued, or less facetiously, what is > the legal status of R? If I were Mathsoft I would be less than pleased > at the development of R and would try to stop it if I could. I have > been wondering for some time if this is possible. But I am not a lawyer > and the issue seems very unclear to me. To me too (Robert spent a

I've got 20 windows desktop machines in a lab on a samba network. Throughout the semester instructors usually find some software they want installed. Has anyone come up with a good way to push out files to all these machines? I've seen demos of software management in Windows 2003. Or any inexpensive commercial product for software management for networks that are not Windows AD? I think

I am trying to do t-test to test whether the mean of one one column of the data frame is greater then another. please help me out. -- Arkajyoti Jana M. Phil/ 2nd semester Centre for Economic Studies and planning School of Social Sciences Jawaharlal Nehru University New Delhi-67 [[alternative HTML version deleted]]

Hi, I'm looking to do a semester-long course project involving LLVM. To avoid duplicating efforts, I wanted to know if the following projects (lifted off http://llvm.org/OpenProjects.html) are done with or are currently worked upon. Atleast I couldn't find evidence of these in the 1.9 sources. 1. Implement GVN-PRE, a powerful and simple Partial Redundancy Elimination

Dear R People: I'm not sure if I should be asking here or R-devel, but here goes: Will there be a new version of R coming out in the next few weeks, please? I'm setting up for the spring semester and want the students to have the latest version. Thanks very much, Sincerely, Erin -- Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of

Hi Roland and folks: Roland's and Susanna's comments were very interesting. I think we need to keep in mind that unlike SPSS, R is more than a statistical package. It's a tool. SPSS does indeed make life easy, particularly for data preprocessing (or data "cleaning"), something that is perhaps not advisable using R (the current versions). Also, I think it's a myth that R

Does anyone know what I should be doing if I want to cross compile LLVM for the ARM architecture? I want to use the LLVM JIT on ARM for a class project this semester. I have built and/or installed a few different gcc arm (arm-linux, and also one that is arm-elf) toolchains, and have had trouble getting LLVM 2.6 to configure and compile using the --host and --build switches of the config. If there