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N — total number of fields.
7 6  2 0 
   , 0 764
7 8  9  6  .
Condition of non-accidentally relationship of
characteristics m and η for association analysis is following
inequality:
3
  , (4.23)
N  1
  , 0 764  , 0 803
means that relationship between
porosity and coefficient of oil extraction,
for considered fields, is casual and inconsequential.
Numerical values of k and η are given in table

k, мкм 2 η > 0,35 η < 0,35 Sum up
-3
k > 5∙10 9 (а) 0 (b) 9 (a+b)
k < 5∙10 -3 1 (с) 5 (d) 6 (c+d)
Sum up 10 (a+c) 5 (b+d) 15 (N)
For permeability:
45
   , 0 866
9 6 10 5  ;

  , 0 886  , 0 803
.
Connection between permeability and coefficient of oil
extraction for our example is substantial and significant. It is
advisable to learn it more.
To reject abnormal values in method of D. Himelblau
(values that differ significantly):
1. Determine value Δ max:
  X  X (4.24)
max max ,

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