From rhoskins@home.com Mon Jul 24 17:05:27 2000
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From: "Dick Hoskins" <rhoskins@home.com>
To: <waphgis@u.washington.edu>
References: <2733FFCBA624D4119DAA0008C75D7725586AFD@nihexchange7.nih.gov>
Subject: Re: health data mapping
Date: Mon, 24 Jul 2000 17:05:22 -0700
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This is natural breaks?

Dick Hoskins
rhoskins@home.com


----- Original Message -----
From: "Pickle, Linda (NCI)" <picklel@mail.nih.gov>
To: <waphgis@u.washington.edu>
Sent: Monday, July 24, 2000 8:14 AM
Subject: RE: health data mapping


> Jenks refers to a method of assigning categories "optimally", so that the
> error sums of squares is less within the category than between categories.
> Can a geographer/cartographer add to this?
>
> Linda Williams Pickle, Ph.D.
> Senior Mathematical Statistician
> Statistical Research and Applications Branch
> Surveillance Research Program
> Division of Cancer Control and Population Sciences
> National Cancer Institute
> EPN Room 4103, MSC 7359
> 6130 Executive Blvd., Bethesda, MD 20892
> (for overnight delivery, use Rockville, MD 20852)
> Branch phone: 301-435-7739; Fax: 301-435-3710
> Email: picklel@mail.nih.gov
>
>
> -----Original Message-----
> From: Dick Hoskins [mailto:rhoskins@home.com]
> Sent: Monday, July 24, 2000 10:10 AM
> To: waphgis@u.washington.edu
> Subject: Re: health data mapping
>
> Linda:  What are Jenks?
>
> Everyone else:  I saw a web site (a geography dept?)  that
> had some
> materials , maybe a tutorial, on categories and maps, but I
> cannot find it
> again. Any ideas where that may be?
>
> Dick Hoskins
> rhoskins@home.com
>
>
> ----- Original Message -----
> From: "Pickle, Linda (NCI)" <picklel@mail.nih.gov>
> To: <waphgis@u.washington.edu>
> Sent: Monday, July 24, 2000 5:52 AM
> Subject: RE: health data mapping
>
>
> > I have been working with Cindy Brewer of Penn State to
> compare methods of
> > creating categories for health rate maps.  Quantiles seem
> to convey the
> > underlying data accurately for all types of questions and
> even non-normal
> > data distributions.  Other methods tested included Jenks
> and equal width
> > intervals (+ 4 others)
> >
> > Linda Williams Pickle, Ph.D.
> > Senior Mathematical Statistician
> > Statistical Research and Applications Branch
> > Surveillance Research Program
> > Division of Cancer Control and Population Sciences
> > National Cancer Institute
> > EPN Room 4103, MSC 7359
> > 6130 Executive Blvd.
> > Bethesda, MD 20892
> > (for overnight delivery, use Rockville, MD 20852)
> > Branch phone: 301-435-7739
> > Email: picklel@mail.nih.gov
> >
> >
> > -----Original Message-----
> > From: Rosmaire Kelly [mailto:rosmaire@worldnet.att.net]
> > Sent: Friday, July 21, 2000 8:41 PM
> > To: waphgis@u.washington.edu
> > Subject: health data mapping
> >
> > Are there conventions for creating categories when mapping
> > health
> > data?  I am involved in a project to map a variety of
> health
> > data in
> > Ohio at county (and possibly census tract) level, and
> would
> > appreciate any information from anyone who has been
> involved
> > in this
> > sort of work.
> >
> > Thanks in advance,
> >
> > Rosmarie Kelly
> > MPH student
>

.