The variables investigated in this study were chosen based on their expected influence on briquette quality: sample batch (S), i.e., two different samples, A and B, of rice
husks and corn cobs obtained for two different seasons and farms
sites, material ratio (M), i.e., percentage mass of rice husks in the
blend of rice husks and corn cobs, and binder addition (B), i.e. mass of
starch and water added as a percentage of the rice husk and corn cob
blends, and compaction pressure (P).