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2011 Confidence Interval Detail
189/Presidio
189-901/Marfa ISD

Category Summary

(1)
Category
(1)
Local
Value
(1)
Stratum
Ratio
(1)
State
Value
(2)
Sample
Size
(3)
Total
Parcels

Stratum
Variance
A 15,158,140 0.6690 22,657,907 10 381 .382546603
A 15,381,080 0.8207 18,741,416 11 219 .080676573
A 15,807,060 0.9113 17,345,616 10 153 .037651980
A 15,686,622 0.8247 19,021,004 10 96 .033061093
D3 18,434,917 0.9749 18,909,547 18 5,222 .004828725
F1 4,071,030 0.8630 4,717,300 11 72 .025838681
F1 3,208,680 0.9496 3,378,981 8 27 .001340144
F1 4,706,030 0.9555 4,925,201 12 17 .024188223
F1 3,212,536 0.3762 8,539,436 3 4 .998206253
Random Totals: 95,666,095   118,236,408 93 6,191  
Catg J Exception Values: 23,533,832   23,781,219      
Catg D1 Exception Values: 12,860,040   16,285,213      
Total Test Values (4): 132,059,967   158,302,840      

Margin of Error

Margin of Error Percent: 6.8594152
Margin of Error Value: 10,858,649

Confidence Interval Values (5)

Local Test Value: 132,059,967 (Outside Confidence Interval)
State Lower Limit: 147,444,191 (State Test Value minus Margin of Error Percent)
State Upper Limit: 169,161,489 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 166,757,219 (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
(6) Includes local value of unstudied property categories and sub-categories

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