Bonjour
Formule en B23 (Validation normale), incrémentée vers la droite
=SOMMEPROD(NB.SI($A5:$A12;INDIRECT("BD!A"&EQUIV($A23;BD!$A:$A;0)+1&":A"&EQUIV($A24;BD!$A:$A;0)-1))*(DECALER(INDIRECT("BD!A"&EQUIV($A23;BD!$A:$A;0)+1&":A"&EQUIV($A24;BD!$A:$A;0)-1);0;EQUIV(B$22;BD!$B$5:$Z$5;0)+1)))/SOMMEPROD(NB.SI($A5:$A12;INDIRECT("BD!A"&EQUIV($A23;BD!$A:$A;0)+1&":A"&EQUIV($A24;BD!$A:$A;0)-1))*(DECALER(INDIRECT("BD!A"&EQUIV($A23;BD!$A:$A;0)+1&":A"&EQUIV($A24;BD!$A:$A;0)-1);0;EQUIV(B$22;BD!$B$5:$Z$5;0))))
Formule en B24 (Validation matricielle avec les 3 touches ctrl+Maj+Entrée), incrémentée vers la droite
=SOMMEPROD(NB.SI($A15:$A17;INDIRECT("BD!A"&EQUIV($A24;BD!$A:$A;0)+1&":A"&MAX(SI(BD!$A$1:$A$1000<>"";LIGNE(BD!$A$1:$A$1000)))))*(DECALER(INDIRECT("BD!A"&EQUIV($A24;BD!$A:$A;0)+1&":A"&MAX(SI(BD!$A$1:$A$1000<>"";LIGNE(BD!$A$1:$A$1000))));0;EQUIV(B$22;BD!$B$5:$Z$5;0)+1)))/SOMMEPROD(NB.SI($A15:$A17;INDIRECT("BD!A"&EQUIV($A24;BD!$A:$A;0)+1&":A"&MAX(SI(BD!$A$1:$A$1000<>"";LIGNE(BD!$A$1:$A$1000)))))*(DECALER(INDIRECT("BD!A"&EQUIV($A24;BD!$A:$A;0)+1&":A"&MAX(SI(BD!$A$1:$A$1000<>"";LIGNE(BD!$A$1:$A$1000))));0;EQUIV(B$22;BD!$B$5:$Z$5;0))))
Cordialement