regressikynnysmalli
A regressikynnysmalli, which translates to "regression threshold model" in English, is a statistical concept used in regression analysis. It is a type of regression model that incorporates a threshold effect. This means that the relationship between an independent variable and a dependent variable is not assumed to be linear or smooth across the entire range of the independent variable. Instead, the model posits that there is a specific value, or threshold, for the independent variable. Changes in the dependent variable are assumed to occur at different rates or in different ways before and after this threshold is crossed.
For instance, consider the relationship between fertilizer application and crop yield. Up to a certain point,