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DATE: 01/26/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 10:20:31                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              020/Brazoria                                              VRSN:      W
                                                        020-907/Columbia-Brazoria ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A              111,285,159        0.9665           115,142,430              22            2,109         .001186352
      2           A              111,327,950        0.9740           114,299,743              31            1,281         .001286595
      3           A              111,256,091        0.9993           111,334,025              34              906         .017104425
      4           A              111,241,515        0.9656           115,204,552              13              560         .001029452
      5           D3              50,271,410        0.9862            50,974,863              11            3,481         .021044383
      6           F1               9,942,834        0.8571            11,600,553               7              185         .025016610
      7           F1               9,894,109        0.8685            11,392,181               6               71         .059818629
      8           F1               9,927,634        0.8477            11,711,259               5               25         .014097316
      9           F1               9,796,852        0.8876            11,037,463               4                9         .004945894
     10           G1              26,960,594        0.9956            27,079,745               8               32         .032425330
  RANDOM TOTALS:                 561,904,148                         579,776,814             141            8,659
  CATG J  EXCEPTION VALUES:       33,948,857                          37,999,240
  CATG D1 EXCEPTION VALUES:        9,755,290                           9,189,696
 TOTAL TEST VALUES (4):          605,608,295                         626,965,750
 MARGIN OF ERROR PERCENT:          5.0000001
 MARGIN OF ERROR VALUE:           31,348,288
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            595,617,462 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             605,608,295 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            658,314,038 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             612,929,695 (SEE ISD SUMMARY WORKSHEET)

 SOURCES:
 (1) SEE STRATIFIED CATEGORY WORKSHEET REPORTS PTS236, PTS430
 (2) NUMBER OF PARCELS SAMPLED BY STAFF
 (3) TOTAL CATEGORY PARCELS FROM STRATIFICATION REPORT APPRAISAL ROLL, OR SELF-REPORT
 (4) INCLUDES ANY PARCELS IN A, B, C, D3, F1, G1, G2,OR L1 MARKED AS EXCEPTION PROPERTIES
 (5) UNSTUDIED CATEGORIES AND SUB-CATEGORIES WERE NOT INCLUDED IN THE CONFIDENCE INTERVAL VALUES