
164 Chapter 4 StatiStiCS for Data Mining
count(∗) from RmSale where tax)/(select count(∗) from RmSale,” which retrieve the
expected frequencies in Table 4.13. Finally, the c
2
-based query retrieves the
total cell contribution of 49.66 from Table 4.14. The functions and operators
used, such as count(∗), multiplication, and division retrieve arrays, and c
2
(∗)
retrieves the cumulative cell contributions.
4.7 lInear regressIon
The linear regression approach is used to fit a linear relationship between
one variable, called the dependent variable, and one or more other variables,
called the independent variable(s). Regression analysis is ...