{"published":"2026-01-25 01:50:53","author_url":"https://blog.hatena.ne.jp/chaos_kiyono/","categories":["Fundamentals of Digital Filters","Fundamentals and Applications of Savitzky\u2013Golay Filters","R","time series analysis","FIR filter"],"provider_name":"Hatena Blog","type":"rich","blog_url":"https://chaos-r.hatenadiary.jp/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fchaos-r.hatenadiary.jp%2Fentry%2F2026%2F01%2F25%2F015053\" title=\"An Introduction to Savitzky\u2013Golay Filters (Part II): Estimates of the Cutoff Frequency - Ken-Chaos\u2019s Random Notes on R\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"An Introduction to Savitzky\u2013Golay Filters (Part II): Estimates of the Cutoff Frequency","image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/c/chaos_kiyono/20260125/20260125012055.png","height":"190","width":"100%","version":"1.0","author_name":"chaos_kiyono","url":"https://chaos-r.hatenadiary.jp/entry/2026/01/25/015053","provider_url":"https://hatena.blog","blog_title":"Ken-Chaos\u2019s Random Notes on R","description":"This article summarizes my own analysis of the cutoff frequency of the Savitzky\u2013Golay (SG) filter. To the best of my knowledge, the results presented here\u2014particularly the revised cutoff-frequency formulas introduced below\u2014are not available in standard textbooks or online references. While some aspe\u2026"}