From pdalgd at gmail.com  Fri Nov 14 10:09:26 2014
From: pdalgd at gmail.com (peter dalgaard)
Date: Fri, 14 Nov 2014 10:09:26 +0100
Subject: [Rd] Correction in help(factanal)
In-Reply-To: <4B6A3570-97BB-4907-B5CE-A073CBA0DDE3@anu.edu.au>
References: <4B6A3570-97BB-4907-B5CE-A073CBA0DDE3@anu.edu.au>
Message-ID: <78326C1D-3288-4E8C-9871-A77928579E84@gmail.com>

Right. (Well, I suppose that you could transpose x and Lambda, but then it would have to be  x = f Lambda + epsilon and all the dimensions would be wrong.)

I'll fix this in R-devel.

-pd

> On 14 Nov 2014, at 00:13 , John Maindonald <john.maindonald at anu.edu.au> wrote:
> 
> <<<
> Thus factor analysis is in essence a model for the correlation matrix of x,
> 
> ? = ?'? + ?
>>>> 
> 
> This should surely be ? = ??' + ?
> 
> Also line 3 under ?Details? says
> <<<
> for a p?element row-vector x, ?
>>>> 
> 
> x is here surely a column vector, albeit the transpose of a row vector
> from the data matrix.
> 
> cf page 322 of ?Modern Applied Statistics with S?, 4th edn.
> 
> John Maindonald             email: john.maindonald at anu.edu.au
> phone : +61 2 (6125)3473    fax  : +61 2(6125)5549
> Centre for Mathematics & Its Applications, Room 1194,
> John Dedman Mathematical Sciences Building (Building 27)
> Australian National University, Canberra ACT 0200.
> 
> 
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel

-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com



[Rd] Correction in help(factanal)
peter dalgaard