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Projprev 1.0.1
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The purpose of the Projected Prevalence (ProjPrev) application is to 
take Limited-Duration Prevalence statistics from SEER*Stat and apply 
them to a different population.  The population would typically differ 
in year or geographic area.  ProjPrev is primarily used to derive 
U.S. prevalence by projecting SEER prevalence onto U.S. populations.

You must first run SEER*Stat to create and export Limited-Duration 
Prevalence values, using "by" (table) variables consistent with the 
intended population.  The export comes in the form of two files, a 
dictionary (.dic) and a text file (.txt) containing the data.  The 
output from this system is also in the form of a dictionary and text 
data file combination.

The populations provided with SEER*Stat are mid-year population 
estimates, the default for prevalence estimates is January 1.  
January 1 populations can be estimated by averaging the populations 
of two successive years.  Calculate the populations for the 2 years 
of interest and then allow ProjPrev to divide them by 2 to create 
the average.

The interface allows users to match prevalence variables to their 
corresponding population variables, and to rename them for output 
as needed.  Output variable formats may also be edited to match the 
corresponding population variable formats.  All prevalence variables
do not need to be in the population.  For example you may have
prevalence by non-population variables such as cancer site.  The
interface allows only one population variable without matching
prevalence data.

An example of ProjPrev usage is available on the web at:
   www.srab.cancer.gov/software/prevalence.html

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REVISION HISTORY
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10/13/2005 - Version 1.0.1
 1. New functionality added to search for data file in dictionary file
    directory, if the file is not found in the location specified in the
    dictionary file.
 2. Populations for projecting can now also be loaded from a SEER*Stat 
    rate session.  The previous version required populations to come from
    a frequency session.  To load from a rate session, all other
    statistics other than the population must be hidden using SEER*Stat's
    matrix options dialog.
 3. A fix was made to not include statistics in the output dictionary
    and data file that were included in the limited-duration prevalence
    file, but not used by Projprev.
 4. The output data file name is now included in the output dictionary
    file.
 
8/23/2005 - Version 1.0 - Initial release.