algebra
{
CE=100*VCE/PC;
Y=100*VPDI/PC;
GFW=100*VGFW/PC;
NFW=100*VNFW/PC;
HW=100*VHW/PC;
DB=GFW-NFW;
NW=GFW+HW-DB;
LCE=log(CE);
LY=log(Y);
LNFW=log(NFW);
LNW=log(NW);
DLCE=diff(LCE,1);
DLY=diff(LY,1);
DLNFW=diff(LNFW,1);
DLNW=diff(LNW,1);
DDLCE=diff(DLCE,1);
DDLY=diff(DLY,1);
DDLNW=diff(DLNW,1);
DDLNFW=diff(DLNFW,1);
}