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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 11:12:20                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              178/Nueces                                                VRSN:      W
                                                        178-909/Robstown ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A               33,234,568        0.9446            35,183,748              12            1,570         .029343907
      2           A               33,204,218        0.9243            35,923,637              11              988         .012147232
      3           A               33,201,981        0.9804            33,865,750              12              634         .031966373
      4           A               33,206,224        0.9740            34,092,632              16              354         .022085618
      5           D3              11,752,460        0.9511            12,356,703              10            1,039         .006130812
      6           F1               8,353,171        0.9371             8,913,852               7              175         .016058973
      7           F1               8,253,983        0.9418             8,764,051               7               56         .005047725
      8           F1               8,522,013        0.9602             8,875,248               6               24         .003592670
      9           F1               8,081,813        0.9599             8,419,432               5                8         .000571471
     10           L1               8,448,179        0.9349             9,036,452               8              141         .003140716
     11           L1               8,524,479        0.9631             8,851,084               5               18         .003491280
     12           L1               8,846,781        0.9793             9,033,780               3                6         .000132346
     13           L1               7,378,992        1.0029             7,357,655               2                3         .000027064
  RANDOM TOTALS:                 211,008,862                         220,674,024             104            5,016
  CATG J  EXCEPTION VALUES:       14,404,437                          12,298,178
  CATG D1 EXCEPTION VALUES:       15,044,053                          14,530,297
 TOTAL TEST VALUES (4):          240,457,352                         247,502,499
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:           12,375,125
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:            235,127,374 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:             240,457,352 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:            259,877,624 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):             235,663,227 (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