1. Use SAS EG automatic churn management
http://www.analysisdatabase.com/descargas/ANALISIS%20DE%20ABANDONOS%20RETENCION.pdf
2. SAS forecast methods
http://www.sascommunity.org/sugi/SUGI93/Sugi-93-67%20Little.pdf
http://www.iasri.res.in/sscnars/sas_manual/5-ts_sas_lecture.pdf
http://www.sascommunity.org/sugi/SUGI93/Sugi-93-67%20Little.pdf
http://www.nesug.org/Proceedings/nesug11/sa/sa10.pdf
http://support.sas.com/resources/papers/proceedings12/333-2012.pdf
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