is equipment stat stacking out in global? how does it work?

STAT Equipment 1 Equipment 2 Equipment 3
HP 100% 50% 30%
TP (not tested) 100% 50% 30%
AP (not tested) 100% 50% 30%
ATK 100% 50% 30%
MAG 100% 50% 30%
DEF 100% 20% 10%
SPR 100% 20% 10%
AGI (need more tests) 100% 50% 30%
DEX (not tested) 100% 50% 30%
ACCURACY 100% 50% 30%
EVADE (need more tests) 100% 40% 20%
CRITIC RATE (not tested) 100% 50% 30%
EVADE CRITIC (not tested) 100% 50% 30%

yes, half of 2ndary items / 30% for some, then 25% for third usually (some lower like eva)