Dependent ordinal data

2000-07-03 Thread robert . nemeth
Could somebody please advise me in the following problem: I have a summary score consisting of 5 different item, which are definitely not independent from each other. Each item describes the severity of a given symptom (medical) on a scale of absent, mild, moderate or severe. These

Re: lin. reg.

2000-07-03 Thread John Hendrickx
In article [EMAIL PROTECTED], [EMAIL PROTECTED] says... Hi, Does someone know were I can download an EXCEL macro for lin reg? Besides it calculates the y=bx+a I like the possibility to give Y and then the macro calculates the x with s. Excel 97 has an add-in for doing regression and

Re: Ancova question

2000-07-03 Thread Donald Burrill
On Mon, 3 Jul 2000, Miguel Verdu wrote: In an ANCOVA where covariate interacts with the independent variable, should the covariate be nested within the independent variable?. I would appreciate bibliographic references on this matter. In general, interaction can be observed only if the

Re: cubic regression

2000-07-03 Thread Donald Burrill
On Sat, 1 Jul 2000, Paul Velleman wrote: I'm not real comfortable with a polynomial model that takes nearly half the available degrees of freedom and offers no theoretical motivation. "Comfortable" is not a word that much occurs to mind in the context of polynomial models. From the

Re: cubic regression

2000-07-03 Thread Robert Dawson
Paul Velleman wrote: I'd rather fit log(wt) on day. and Donald Burrill responded: Agreed. (Any day!-) This has the further virtue of permitting "doubling time" to be defined and estimated, for the range in which the exponential growth function appears to be an adequate description.

Re: lin. reg.

2000-07-03 Thread Humberto Barreto
At 10:01 AM +0200 7/3/00, John Hendrickx wrote: Excel 97 has an add-in for doing regression and certain other statistical analyses. snip It's limited to bivariate regression though. That's not right. Trendline is limited to bivariate. With Data Analysis: Regression, you can select a contiguous

Re: I need help!!! SPSS and Panel Data

2000-07-03 Thread Bruce Weaver
On Sun, 2 Jul 2000 [EMAIL PROTECTED] wrote: Help! I'm a Norwegian student who can't figure out how to work SPSS 9.0 properly for running a multiple regression on panel data (longitudinal data or cross-sectional time-series data). My data set consist of financial data from about 300 Norw.

Re: cubic regression

2000-07-03 Thread Donald Burrill
On Fri, 30 Jun 2000, dennis roberts wrote: interesting but ... 3 questions: 1. how can the r squared for the best model be 100% when, the errors are not all 0s? R-sq is not 100% exactly, it is reported as 100.0%. Examining the SS reported shows that R-sq = 3361.7/3361.9 = 99.994%,

Re: Dependent ordinal data

2000-07-03 Thread Donald Burrill
On Mon, 3 Jul 2000 Robert NĂ©meth [EMAIL PROTECTED] wrote: Could somebody please advise me in the following problem: I have a summary score consisting of 5 different items, which are definitely not independent from each other. By "summary score", do you mean you are using as a dependent