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2006 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 10,173,662 0.8789 11,575,449 7 385 .028387694
A 10,152,135 0.6400 15,862,711 13 216 .181077847
A 10,119,389 0.5460 18,533,679 18 144 .157746263
A 10,107,308 0.8262 12,233,488 19 80 .141709938
D3 12,485,761 0.9271 13,467,545 20 4,757 .018179698
F1 2,470,671 0.4356 5,671,880 5 76 .445446813
F1 2,605,717 0.8212 3,173,060 9 30 .110201928
F1 4,799,186 0.9264 5,180,468 5 11 .006113063
Random Totals: 62,913,829   85,698,280 96 5,699  
Catg J Exception Values: 15,855,726   15,504,758      
Catg D1 Exception Values: 13,023,660   15,703,358      
Total Test Values (4): 91,793,215   116,906,396      

Margin of Error

Margin of Error Percent: 5.4381310
Margin of Error Value: 6,357,523

Confidence Interval Values (5)

Local Test Value: 91,793,215 (Outside Confidence Interval)
State Lower Limit: 110,548,873 (State Test Value minus Margin of Error Percent)
State Upper Limit: 123,263,919 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 106,089,663 (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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