similar to: data frames, na.omit, and sums

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:

Hello everyone, I am new to R, using version 2.0.1 on a Macintosh running OS X 10.3. I am learning how to export graphics to postscript format using the postscript() function, but R is only writing empty files. Yesterday, postscript() was working for me. Today, I don't know what's wrong. Can somebody suggest some things that might fix this problem? Thanks in advance for you help.

Dear R Users, I'm very very interested in learning how to use R to carry out a classification of data using discriminant function analysis. I've found the MASS package and the lda function, but the examples in the help system are a bit over my head. I'm not exactly sure how to interpret the output, for example, of if the inputs I've chosen are best suited to my needs. I

Hi all, Apple's LLVM Source Tools and Program Analysis teams are now looking for exceptional interns for summer 2015! These are paid internships based onsite at Apple's main campus in Cupertino, California, USA. Internships last 12 weeks, with internships starting in May or later (start dates are flexible). During the internship, interns will work directly with members of Apple's

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

It seems that using a join model that joins with two has_many''s will fail to generate proper SQL class StudentSemesterRecord < ActiveRecord::Base belongs_to :semester has_many :discipline_records, :through => :semester end class Semester < ActiveRecord::Base has_many :student_semester_records has_many :discipline_records end class DisciplineRecord <

Hi all, I am having problems running a logon script from a Winxp pro client. It appears that the logon script is not being run at all. Win98 runs the script fine, but none of the Winxp pro clients are currently running it. I am running RedHat 7.1 with Samba version 2.2.7-security-rollup-fix. My smb.conf is as follows: [global] netbios name = LOKKI server string = Lokki PDC

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

I has several model objects that flow down like a tree: Class1 has_many Class2 Class2 has_many Class3 and so on. when are the child records actually created? If I do: c1 = Class1.find(:all) are the child objects (C2s below) created then or not until i do something like: c2s = c1.C2s while iterating through the c1s? If the form, that''s cool, no problem, but If I''ve got

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,

Hi, I've had a stable Samba-run LAN, with some active shares, for several months, with my PC and laptop also gaining access to the Internet through the Samba server. However, this morning, when I booted up my Samba server, I had no LAN--neither my PC nor my laptop could connect to any share. However, both still had access to the Internet. I confirmed that smb, named, winbindd, et al.,

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-group members, I use: platform i386-pc-mingw32 arch x86 os Win32 system x86, Win32 status major 1 minor 4.1 year 2002 month 01 day 30 language R I try to fit a 2 compartment model. The compartments are open, connected to each other and

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

Hi all, It was brought to my attention that the front page lists 0.23.3 as the stable release, but that no such release exists. I could have sworn I released this a few weeks ago, but now I can find no evidence of that. I''m going to publish it from the latest commit in the 0.23.x branch as soon as possible (probably in about 12 hours), so if anyone wants to get that last-minute

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

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

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