igned ▁from ▁office ▁in ▁mid - 2 0 1 8 . ▁However , ▁he ▁still ▁serves ▁as ▁a ▁fac ulty ▁member ▁and ▁professor ▁in ▁College ▁of ▁Science ▁and ▁teach es ▁basic ▁statistics , ▁quant itative ▁business ▁analysis , ▁management ▁science ▁statistics ▁and ▁other ▁higher ▁statistics ▁subjects . ▁He ▁also ▁man ages ▁several ▁working ▁groups ▁and ▁comm itte es ▁such ▁as ▁the ▁Feder asy on ▁ng ▁m ga ▁Al umn i ▁Associ ations ▁sa ▁P UP , ▁Inc ▁( F ED AA PI ), ▁Un y on ▁ng ▁m ga ▁gu ro ▁sa ▁P UP , ▁etc . ▁ ▁Ser iously ▁Add ict ive ▁Math s ▁Singapore ▁( 2 0 1 9 - present ) ▁ ▁After ▁leaving ▁his ▁seat ▁as ▁Vice ▁President ▁for ▁Research , ▁Ext ension , ▁Pl anning ▁and ▁Development , ▁Mer c ado , ▁with ▁his ▁wife , ▁started ▁a ▁business ▁franch ise ▁partners hip ▁with ▁Ser iously ▁Add ict ive ▁Math s ▁Singapore ▁( S . A . M ) ▁and ▁opened ▁a ▁branch ▁in ▁Man ila , ▁in ▁November ▁of ▁ 2 0 1 9 . ▁ ▁Notable ▁works ▁ ▁Scient ific ▁publications ▁ ▁Mer c ado ▁has ▁author ed ▁and ▁co - author ed ▁several ▁scientific ▁publications ▁that ▁have ▁been ▁recognized ▁in ▁national ▁and ▁international ▁journ als . ▁▁ ▁Among ▁them ▁are , ▁but ▁not ▁limited ▁to ; ▁“ Math emat ical ▁Model ▁for ▁Est im ating ▁In come ▁Tax ▁Re ven ues ▁in ▁the ▁Philippines ▁through ▁Reg ression ▁Analysis ▁using ▁Mat rices ” ▁“ Pred ict