Re: FAVOUR - Marking Scripts Statistically!

2000-10-29 Thread MJ Ray
[EMAIL PROTECTED] writes: I expected this to be a fairly common problem and hoped that a standard "formula" would already exist for it. As you quite correctly show, there are a huge number of possible scores given 10 grades (I thought of working this out but I think the factorials get too

Re: FAVOUR - Marking Scripts Statistically!

2000-10-29 Thread Radford Neal
In article 8tg0i6$k85$[EMAIL PROTECTED], [EMAIL PROTECTED] wrote: ... I am grading an HTML coursework. I have to look at their web pages and mark them against ten requirements given me as criteria, and grade each from "A" to "F". Unfortunately the schema is flawed because for example: "is xxx

Confidence intervals

2000-10-29 Thread Arun Nagarkatti
I am looking through notes for confidence interval for the exponential mean. I have been given that: Suppose Y_1,...,Y_n ~ Exp(t^(-1)) independently. Then for each of the Y_i: f(y_i|t) = t^(-1) exp(-y_i/t). We are then finding the maximum likelihood estimator ^t^, and with various

Re: FAVOUR - Marking Scripts Statistically!

2000-10-29 Thread mart_b
Thank you all very much for your sensible replys. I was hoping to get my marking done over the weekend, but I'm going to see the Course Leader tomorrow and put my case to him and perhaps get a marking scheme more suitable. These are only first year assignments that don't count for much, but

Re: Stat pkg for old Mac

2000-10-29 Thread Richard Osborne
JMP version 4 is out now. Try http://www.jmpdiscovery.com/ this is a great program! It was actually written for the Mac and ported to Windows. They have a demo program available for downloading too. R. Lee Creighton wrote in message 8tc01k$4ve$[EMAIL PROTECTED]... JMP version 3 would run on

Re: FAVOUR - Marking Scripts Statistically!

2000-10-29 Thread Rich Ulrich
On Sat, 28 Oct 2000 18:35:23 +0100, "haytham siala" [EMAIL PROTECTED] wrote: Hi, I have to mark scripts based on a marking scheme thus: 10 questions of equal weighting, grade each answer from A to F. So each question , obviously, counts for 10%. Given a random set of grades how do I

Re: Confidence intervals

2000-10-29 Thread Ellen Hertz
Neeraj, It is easy to verify that if Y is exponential with mean t then Y/t is is exponential with mean 1. Also, the sum of n exponentials with parameter 1 has the distribution Gamma(n,1). Most texts on probability and statistics (Feller Vol II, Mood and Graybill) are references. It is a