Hi Miles,
If I read the paper correctly, zeta-squared is simply: (1+z^2) for z>=0, and
1/(1+z^2) for z<=0, where z is the z-score (Eqn. 11 in the paper). Z-scores can
be calculated in R using the scale(...) function. So this should produce a
zeta-squared transformation.
zeta.sq <- function(data) {
z.sq <- scale(data)^2
zeta.sq <- ifelse(z.sq>0,1+z.sq,1/(1+z.sq))
}
Simple example: 100 respondents, 3 questions. First question scored on (1,7),
second question scored on (-10,10), third question scored on (0,100) in 0.01
increments.
set.seed(1) # for reproducible example
df <- data.frame(Q1=sample(1:7,100,replace=T),
Q2=sample(-10:10,100,replace=T),
Q3=sample(seq(0,1,len=101),100,replace=T))
# transform the data...
result <- zeta.sq(df)
Regards,
John Howard
Prism Marketing Group
http://www.prismmg.com
-----Original Message-----
From: Miles Yang [mailto:miles2y...@gmail.com]
Sent: Saturday, July 12, 2014 7:31 AM
To: Jeff Newmiller
Cc: r-help@r-project.org
Subject: Re: [R] Zeta-squared transformation use R?
Hi Jeff,
Yes, I searched that but it comes out "zeta-squared coefficient" instead of
transformation method.
I hope if there is someone have the experience in applying "zeta-squared
transformation" in R?
Appreciate any help on this.
Regards,
miles
On Sat, Jul 12, 2014 at 4:01 PM, Jeff Newmiller <jdnew...@dcn.davis.ca.us>
wrote:
> Have you tried
>
> RSiteSearch("zeta squared")
>
> ?
>
> Someone may recognize this, but it never hurts to communicate where
> you have already looked.
>
> ---------------------------------------------------------------------------
> Jeff Newmiller The ..... ..... Go Live...
> DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live
> Go...
> Live: OO#.. Dead: OO#.. Playing
> Research Engineer (Solar/Batteries O.O#. #.O#. with
> /Software/Embedded Controllers) .OO#. .OO#. rocks...1k
> ----------------------------------------------------------------------
> ----- Sent from my phone. Please excuse my brevity.
>
> On July 11, 2014 9:44:43 PM PDT, Miles Yang <miles2y...@gmail.com> wrote:
> >Hi R-helpers,
> >
> >Is there any packages can do "*zeta-squared transformation*"?
> >
> >The Zeta-squared transformation comes from the following article:
> >Standardizing Variables in Multiplicative Choice Models Lee G. Cooper
> >and Masao Nakanishi Journal of Consumer Research, Vol. 10, No. 1
> >(Jun., 1983), pp. 96-108
> >
> >Thanks for any help in advance.
> >
> >miles
>
>
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