The's specialists will probably assess the capacity {\displaystyle f(x_{i},\beta )}{\displaystyle f(x_{i}, \beta)} that most intently fits the information. To complete relapse examination, the type of the capacity {\displaystyle f}f should be determined. Some of the time the type of this capacity depends on information about the connection between {\displaystyle Y_{i}}Y_{i} and {\displaystyle X_{i}}x_{i} that doesn't depend on the information. Assuming no such information is accessible, an adaptable or advantageous structure for {\displaystyle f}f is picked. For instance, a basic univariate relapse might propose {\displaystyle f(x_{i},\beta )=\\beta _{0}+\beta _{1}x_{i}}{\displaystyle f(x_{i}, \beta)=\beta _{0}+\beta _{1}x_{i}}, recommending that the scientist accepts {\displaystyle Y_{i}=\beta _{0}+\beta _{1}x_{i}+e_{i}}{\displaystyle Y_{i}=\beta _{0}+\beta _{1}x_{i}+e_{i}} to be a sensible estimation for the measurable cycle creating the information.