 Kokoma botangi na ntina ya bokeseni kati ya boyokani ya linéaire na boyokani ya courviline.
Boyokani ya linéaire ezali lolenge ya boyokani kati ya ba variables mibale oyo ezali na taux constant ya changement. Yango elingi koloba ete soki variable moko ebongwanaki, variable mosusu ekobongwana na ndenge ya boyokani mpe oyo ekoki kokanisama. Ntango esalemi na graphique, ba points ezala na momesano ya kosala ligne droite, yango wana babengaka yango liloba ‘ligneaire’. Ba relation linéaire ekoki kozala positive to négative, selon direction ya relation. Na boyokani ya linéaire positif, lokola variable moko emati, mosusu pe emati, alors que na relation linéaire négative, tango variable moko emati, mosusu ekiti. Epayi mosusu, boyokani ya curvilinéaire ezali lolenge ya boyokani kati ya ba variables mibale esika mbongwana na variable moko ekokani te na mbongwana ya ntango nyonso na variable mosusu. Au lieu ya kosala bongo, boyokani ezuaka forme courbe, mpe vitesse ya changement entre ba variables mibale ekeseni. Ba relation curvilinéaire ekoki pe kozala positive to négative, na direction ya relation oyo ezuami na direction ya courbe. Na relation curvilinéaire positive, ba variables ezala na tendance ya komata to kokita elongo, alors que na relation curvilinéaire négative, lokola variable moko emati, mosusu ekiti. Mpo na kosukisa, bokeseni ya ntina kati ya boyokani ya linéaire mpe ya linéaire ezali na lolenge ya boyokani kati na ba variables mibale. Ba relation linéaire elakisaka taux ya changement constant, alors que ba relation courvilinéaire elakisaka taux ya changement variable. En plus, ba relation linéaire elakisami na ligne droite na graphique, alors que ba relation courviline elakisami na ligne courbe. Ba relation linéaire pe curvilinéaire ekoki kozala positive to négative, pe direction ya relation ezuami na tendance générale ya ba données.