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DATE: 01/23/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:33:15                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              189/Presidio                                              VRSN:      W
                                                        189-901/Marfa ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A                7,994,888        0.3853            20,749,774              11              388         .091334451
      2           A                7,981,083        0.5842            13,661,559              12              219         .053281080
      3           A                7,975,730        0.6579            12,123,013              14              144         .030768464
      4           A                7,926,570        0.7034            11,268,937              15               73         .030264366
      5           D3              10,667,299        0.8645            12,339,270              20            4,732         .063730944
      6           F1               2,460,388        0.9031             2,724,380               7               74         .018530776
      7           F1               2,458,053        0.9801             2,507,961               6               28         .000135901
      8           F1               2,756,370        1.0733             2,568,126               4                9         .024972449
      9           L1               1,194,004        1.4150               843,819               7               55         .183444020
     10           L1               1,152,661        0.9965             1,156,709               6               15         .000265944
     11           L1               1,297,424        1.0153             1,277,873               5                7         .002328122
  RANDOM TOTALS:                  53,864,470                          81,221,421             107            5,744
  CATG J  EXCEPTION VALUES:       15,743,623                          16,067,174
  CATG D1 EXCEPTION VALUES:       13,060,210                          16,939,411
  CATG F1 EXCEPTION VALUES:        2,085,046                           2,129,140
  CATG L1 EXCEPTION VALUES:          805,764                             808,744
 TOTAL TEST VALUES (4):           85,559,113                         117,165,890
 MARGIN OF ERROR PERCENT:          5.0000004
 MARGIN OF ERROR VALUE:            5,858,295
 CONFIDENCE INTERVAL VALUES (5):
   LOCAL TEST VALUE:              85,559,113 (OUTSIDE CONFIDENCE INTERVAL)
   STATE LOWER LIMIT:            111,307,595 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   STATE UPPER LIMIT:            123,024,185 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             122,833,079 (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