Practical Applications of Data Mining

The coefficient value –0.0237 is retrieved from Table 4.4, and the relation

is considered very weak. The corresponding z values after transformation

can be found with the following queries:

(Query 9)

Does the function transformation (n -3)

1/2

tanh

−1

on the measurement of

relationship for the northeast and corner location from the table RmSale

indicate any correlation?

(SQL 9)

Select (n−3)

1/2

tanh

−1

(corr(∗)) from RmSale where northeast and corner.

The z value –0.188 is retrieved from Table 4.5. Since its absolute value is

much less than 1.96, it indicates no correlation between northeast and corner

location with 95% confidence. Therefore, we conclude that northeast and

corner locations are not related.

4.6 contIngency table and ...