The Hammers have lost three of their four home fixtures in the Premier League campaign, leaving them 15th in the table.
"Lots of teams are finding it tougher to secure points at home and it shows that tactically teams are going away and being strong," BBC Sport quotes Allardyce as saying.
"Everybody said we've got to improve our away form. We've done that but now we've got to get our home form back to where it was last season."
West Ham are due to host Aston Villa on Saturday.