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2012 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 15,316,950 0.8884 17,241,051 15 384 .003242071
A 15,592,010 0.9052 17,224,934 15 220 .010687293
A 15,671,290 0.9145 17,136,457 15 151 .004620142
A 15,993,390 0.9431 16,958,318 15 97 .016266888
D3 18,048,650 0.9219 19,577,666 20 5,264 .020282312
F1 3,705,210 0.8178 4,530,704 16 68 .018168844
F1 3,920,610 0.8204 4,778,901 17 33 .011504773
Random Totals: 88,248,110   97,448,031 113 6,217  
Catg D1 Exception Values: 12,874,660   16,866,218      
Catg F1 Exception Values: 8,021,806   12,543,510      
Total Test Values (4): 109,144,576   126,857,759      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 6,342,888

Confidence Interval Values (5)

Local Test Value: 109,144,576 (Outside Confidence Interval)
State Lower Limit: 120,514,871 (State Test Value minus Margin of Error Percent)
State Upper Limit: 133,200,647 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 165,233,631 (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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