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I.   File Organization:

     The files in the Residential Housing Patterns directory contain 19 indexes of
     residential housing patterns for each race/ethnicity group and MSA/PMSA.
     There is one record per race/ethnicity group and MSA/PMSA (as defined on June 
     30, 1999). There is one file for each year, each race/ethnicity group, and 
     unit of analysis and one file for each year and unit of analysis with all groups 
     combined. All indexes were calculated using Non-Hispanic Whites as the reference 
     group.  The number of race/ethnicity groups and MSAs/PMSAs per year are indicated 
     below.

                         Number of         Number of
             Year   Race/Ethnicity Groups  MSAs/PMSAs

             1980            4                330
             1990            4                331
             2000            6                331


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II.  File Names:

     1980 Files:

       The Unit of Analysis is the Census Tract

         tract1980ALL.dat     ALL race/ethnicity groups
         tract1980aian.dat    American Indian and Alaska Native 
         tract1980api.dat     Asian and Pacific Islander
         tract1980black.dat   Black or African American
         tract1980hisp.dat    Hispanic

     1990 Files:

       The Unit of Analysis is the Census Tract

         tract1990ALL.dat     ALL race/ethnicity groups
         tract1990aian.dat    American Indian and Alaska Native 
         tract1990api.dat     Asian and Pacific Islander
         tract1990black.dat   Black or African American
         tract1990hisp.dat    Hispanic

     2000 Files:

       The Unit of Analysis is the Census Tract

         tract2000ALL.dat     ALL race/ethnicity groups
         tract2000aian.dat    American Indian and Alaska Native 
         tract2000api.dat     Asian and Pacific Islander
         tract2000asian.dat   Asian
         tract2000nhopi.dat   Native Hawaiian and Other Pacific Islander
         tract2000black.dat   Black or African American
         tract2000hisp.dat    Hispanic

       The Unit of Analysis is the Block Group  

         bg2000ALL.dat        ALL race/ethnicity groups
         bg2000aian.dat       American Indian and Alaska Native 
         bg2000api.dat        Asian and Pacific Islander
         bg2000asian.dat      Asian
         bg2000nhopi.dat      Native Hawaiian and Other Pacific Islander
         bg2000black.dat      Black or African American
         bg2000hisp.dat       Hispanic

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III. Record Layout

     Position       Variable

       1-  4        Year
       6- 10        Race/Ethnicity group
      12- 15        MSA/PMSA code
      17- 70        MSA/PMSA name
      72- 80        MSA/PMSA total population
      82- 90        MSA/PMSA minority population
      92- 98        Atkinson index with b=.1 (A1)
     100-106        Atkinson index with b=.5 (A5)
     108-114        Atkinson index with b=.9 (A9)
     116-122        Absolute Centralization index (ACE)
     124-130        Absolute Clustering index (ACL)
     132-138        Absolute Concentration index (ACO)
     140-146        Correlation ratio or Eta squared (V)
     148-154        Dissimilarity index (D)
     156-162        Distance Decay Isolation index (DPxx*)
     164-170        Distance Decay Interaction index (DPxy*)
     172-178        Duncan's Delta index (DEL)
     180-186        Entropy index (H)
     188-194        Gini index (G)
     196-202        Interaction index (xPy*)
     204-210        Isolation index (xPx*)
     212-218        Relative Centralization index (RCE)
     220-226        Relative Clustering index (RCL)
     228-234        Relative Concentration index (RCO)
     236-242        Spatial Proximity index (SP)

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