** RFM Analiz etme kütüphanesi

https://productphilosophy.com/rfm-analizi-nedir-ve-nasil-yapilir/
https://www.cloudyflex.com/blogs/post/zoho-crm-rfm-segmentasyonu-nedir
https://rstudio-pubs-static.s3.amazonaws.com/485897_8ea8c97e33a24eafa15a095c3364a6d0.html
https://rfm.rsquaredacademy.com/
https://rpubs.com/omerperach/RFM_IDC