Deletion of Piecewise regression analysis

Comment: agree with nominator. Lengthy OR essay-style expansion of idea with a single primary source - does not show significant coverage in secondary sources, which is required by . Articles cannot be justified on the grounds that the topic may become notable in the future. No objection to moving essay to user space if the author wishes to work on it outside article space
Stance: delete
Cited policy: Wikipedia:Notability (WP:NOTE)