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October 17, 2011 (Regular Meeting) Page 769 4 10 10.1 0.10 00.10 0.010 5 07 06.3 0.70 00.49 0.053 6 10 07.5 2.50 06.25 0.833 X = 5.422 The number 5.422 is the chi - square for this comparison. It is evaluated based upon what is known as DEGREES OF FREEDOM of the problem and the use of a table of chi - square values common to most statistics texts. We may say here that "degrees of freedom" means the latitude of variation a statistical problem has. It is the number of groups (Nk) minus 3 or V = (Nk - 3) . In this case V = 3. Consulting our table, we find that the probability of having a chi - square due to chance of 5.42 is approximately .75 or sufficiently different from .95 for us to state that the sales do differ significantly from the actual distribution of all parcels. Hence, we would conclude that we should be careful in the extrapolation of sale parcel statistics to the entire distribution of all parcels. Chapter 11 COUNTY SPECIFICATIONS INTRODUCTION This chapter contains all of the specific information which pertains directly to the County. Data contained in this chapter includes: Parcel Number Conventions Valuation Models Improvement Base Rate Schedules Improvement Depreciation Schedules Auxiliary Area Codes Other Building Schedules Extra Feature Schedules Overview of the Appeals Process PARCEL NUMBER CONVENTIONS The following is the format of the County parcel number as required for coding all input data. This number is edited to help prevent incorrect data from reaching the Master Appraisal File. In addition, proper use of this format on the Tax Roll File will enable the Master Appraisal File and Tax Roll Files to be matched for automated transfer of data between these two computer files. CABARRUS COUNTY PARCEL NUMBER CONVENTIONS INTERNAL REPRESENTATION CC LIMITATIONS 01 - 04 Sheet Digit; 4579 -4694, 5505 -5694, 6601 -6613 05 - 06 Block Digit; 00 -99 07 - 10 Parcel Digit; 0000 -9999 11 - 14 Divided Interest Alpha / Digit; 0000 -9999 The following valuation models are the mathematical expressions of value used in determining estimated market value. The quality factors and formulas for determining the index values of each are shown. All fields shown require an entry even though the entry may be zero or blank. Buildings that do not conform to the description defined in this chapter will be priced either through the actual cost found in the area or through the use of Marshall Swift pricing service adjusted to the appraisal date. MODEL 01 SINGLE FAMILY RESIDENTIAL - STRUCTURAL ELEMENT DATA FOUNDATION PTS ROOF STRUCTURE PIS HEATING FUEL PIS 01 EARTH 0 5 IRREGULAR TRUSS 13 01 NONE 0 02 PIERS 2 09 BARJOIST 11 02 OIL /WD /COAL 0