(a) The estimated market value of each “S” and “T” interval in each class shall be computed as follows:

1. (1) Compute the average assessed value of the sample parcels in each “S” interval therein by summing the assessed values of the appraised sample parcels in the interval and dividing the sum by the number of appraised sample parcels in the interval.
2. (2) Compute the average market value of the sample parcels in each “S” interval therein by summing the market values of the appraised sample parcels in the interval and dividing the sum by the number of appraised sample parcels in the interval.
3. (3) Compute the numerator of the weighted average market value ratio of the “S” intervals in the class by first multiplying the average assessed value of the sample parcels in each interval by the number of parcels therein, and then summing the resulting products.
4. (4) Compute the denominator of the weighted average market value ratio of the “S” intervals in the class by first multiplying the average market value of the sample parcels in each interval by the number of parcels therein, and then summing the resulting products.
5. (5) Compute the weighted average market value ratio of the “S” interval in the class by dividing the numerator by the denominator.
6. (6) Compute the estimated market value of each “S” interval in the class by dividing the total assessed value of the interval by the ratio determined in paragraph (5) of this subdivision.
7. (7) Set the assessed value and estimated market value of each “T” interval equal to the assessed value and appraised value, respectively, of the corresponding large unit.

(b) The estimated market value of each “U” interval is computed as follows:

1. (1) In a special assessing unit:

   1. (i) Compute the weighted average market value ratio of all “S” and “T” intervals in a class in a special assessing unit by:

      1. (a) summing the total assessed values of all “S” and “T” intervals in the class in the special assessing unit;
      2. (b) summing the estimated market values of all “S” and “T” intervals in the class of the special assessing unit; and
      3. (c) dividing (a) by (b).
   2. (ii) Compute the estimated market value of each “U” interval in the class in the special assessing unit by dividing the total assessed value of each such interval by the ratio determined in subparagraph (i) of this paragraph.

2. (2) For all other municipalities:

   1. (i) Compute the weighted average market value ratio of all “S” and “T” intervals in the municipality by:

      1. (a) summing the total assessed values of all “S” and “T” intervals in the municipality;
      2. (b) summing the estimated market values of all “S” and “T” intervals in the municipality; and
      3. (c) dividing (a) by (b).
   2. (ii) Compute the estimated market value of each “U” interval in the municipality by dividing the total assessed value of each such interval by the ratio determined in subparagraph (i) of this paragraph.

(c) The estimated market value of each survey unit on the classified roll shall be computed as follows:

1. (1) Determine the total estimated market value of each class therein by summing the estimated market values of all of the intervals in the class.
2. (2) Determine the total estimated market value of the survey unit by summing the estimated market values of all the intervals therein.

(d) For each special assessing unit or homestead assessing unit, the estimated market value ratio of each class in each portion and the estimated market value ratio of each class in the special assessing unit or homestead assessing unit are computed as follows:

1. (1) Determine the total estimated market value of each class in each portion by summing the estimated market values of all of the intervals in each class in each portion.
2. (2) Determine the market value ratio of each class in each portion by dividing the total assessed value thereof by the total estimated market value thereof.
3. (3) Determine the total estimated market value of each class in the special assessing unit or homestead assessing unit by summing the estimated market value of all of the intervals in the class in the special assessing unit or homestead assessing unit.
4. (4) Determine the market value ratio of each class in the special assessing unit or homestead assessing unit by dividing the total assessed value thereof by the total estimated market value thereof.

5. (5) For purposes of establishing class ratios pursuant to former 9 NYCRR Subpart 186-8, as repealed in 1997, the estimated class market value ratio shall be computed in accordance with the following procedure:

   1. (i) Obtain from the assessor's report for the base year roll the initial assessment for the class.
   2. (ii) Obtain from the survey data the estimated class market value except that parcels in class 1B and class 2B shall be excluded.
   3. (iii) The estimated class market value ratio on the base year roll is determined by dividing the initial assessment determined in subparagraph (i) of this paragraph by the estimated class market value determined in subparagraph (ii) of this paragraph.

(e) The estimated market value ratio of each municipality, special assessing unit and portion on the classified roll shall be computed as follows:

1. (1) Determine the total estimated market value thereof by summing the estimated market values of all of the survey units therein.
2. (2) Divide the total assessed value of the property on the classified roll by the total estimated market value thereof.