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DATE: 06/29/2006                         COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         PAGE:      1
TIME: 10:41:00                                       2005 CONFIDENCE INTERVAL DETAIL                                    REPT: PTS428
                                                              043/Collin                                                VRSN:      W
                                                        043-901/Allen ISD
____________________________________________________________________________________________________________________________________
    (1)           (1)                (1)              (1)                (1)              (2)            (3)
 # STRATUM     CATEGORY          LOCAL VALUE     STRATUM RATIO       STATE VALUE     SAMPLE SIZE    TOTAL PARCELS   STRATUM VARIANCE
 _________     ________          ___________     _____________       ___________     ___________    _____________   ________________

      1           A              829,910,432        1.0000           829,910,432              81            5,804         .001532824
      2           A              830,104,331        0.9963           833,187,123              82            4,548         .001393270
      3           A              829,912,434        0.9924           836,268,071              81            3,711         .003032158
      4           A              829,663,837        0.9900           838,044,280              82            2,364         .001417476
      5           F1             130,880,280        0.9774           133,906,568               7              127         .007830459
      6           F1             132,899,062        0.8844           150,270,310               6               45         .016738723
      7           F1             129,526,991        0.9528           135,943,525               6               15         .005066386
      8           F1             128,325,558        0.8438           152,080,538               3                6         .010427486
      9           L1              74,084,748        0.9739            76,070,180               7              371         .000425237
     10           L1              73,435,087        0.8794            83,505,898               6               34         .031494306
     11           L1              93,903,274        1.0218            91,899,857               4                8         .001981404
  RANDOM TOTALS:               4,082,646,034                       4,161,086,782             365           17,033
  CATG D1 EXCEPTION VALUES:        1,611,523                           1,535,213
  CATG L1 EXCEPTION VALUES:       87,632,295                          89,907,338
 TOTAL TEST VALUES (4):        4,171,889,852                       4,252,529,333
 MARGIN OF ERROR PERCENT:          5.0000000
 MARGIN OF ERROR VALUE:          212,626,467
 CONFIDENCE INTERVAL VALUES (5):
   STATE LOWER LIMIT:          4,039,902,866 (STATE TEST VALUE MINUS MARGIN OF ERROR PERCENT)
   LOCAL TEST VALUE:           4,171,889,852 (WITHIN CONFIDENCE INTERVAL)
   STATE UPPER LIMIT:          4,465,155,800 (STATE TEST VALUE PLUS MARGIN OF ERROR PERCENT)
 VALUE ASSIGNED (6):           4,819,716,884 (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