Hello everybody.

I am totally new to GAMS and have no experience with this system.

My master thesis topic is the Data Envelopment Analysis, and I am supposed to demonstrate its application using GAMS.

I have purchased a book by Prof. Emrouznejad entitled “DEA with GAMS - A Handbook on Productivity Analysis and Performance Measurement” and entered the exact code from this book into GAMS. Unfortunately, all I get are errors and I don’t know what to do.

Here is the code:

Sets j DMUs /DMU1*DMU10/

g Inputs and Outputs /ProdCost, TrnCost, HoldInv, SatDem, Rev/

i(g) Inputs /ProdCost, TrnCost, HoldInv/

r(g) Outputs /SatDem, Rev/;

alias(jj,j);

alias(k,jj);

Table Data (j,g)

ProdCost TrnCost HoldInv SatDem Rev

DMU1 0.255 0.161 0.373 20 2.64

DMU2 0.98 0.248 0.606 6 5.29

DMU3 0.507 0.937 0.749 17 2.43

DMU4 0.305 0.249 0.841 2 8.99

DMU5 0.659 0.248 0.979 19 2.94

DMU6 0.568 0.508 0.919 17 0.75

DMU7 0.583 0.628 0.732 17 6.36

DMU8 0.627 0.675 0.738 10 7.2

DMU9 0.772 0.657 0.486 9 2.16

DMU10 0.917 0.639 0.234 8 7.3;

Variables efficiency objective function

Theta efficiency

Lambda(j) dual weights

sminus(i) slacks assigned to inputs

splus(r) slacks assigned to inouts;

Nonnegative Variables

Lambda(j)

sminus(i)

splus(r);

Parameters

DMU_data(g) Data for inputs and outputs for each DMU

eff(j) efficiency (Theta values)

lamres(j,j) peers for each DMU (Lambda values)

slacks(j,g) slacks for inputs and outputs;

Equations

OBJ

CON1(i)

CON2(r);

OBJ… efficiency=E=Theta-1E-6*(SUM(i,sminus(i))+SUM(r,splus(r)));

CON1(i)… SUM(j, Lambda(j)*Data(j,i))+sminus(i)=E=Theta*DMU_data(i);

CON2(r)… SUM(j, Lambda(j)*Data(j,r))-splus(r)=E=DMU_data(r);

Model DEA_CRS input oriented DEA CRS / OBJ, CON1, CON2 /;

loop(jj,

DMU_data(g) = Data(jj,g);

Solve DEA_CRS using LP minimizing Theta;

eff(jj)=Theta.1;

slacks(jj,i)=sminus.1(i);

slacks(jj,r)=splus.1(r);

loop(k,

Lamres(jj,k)=Lambda.1(k);

Parameters xproject(j,i), yproject(j,r);

xproject(j,i)=eff(j)*Data(j,i)-slacks(j,i);

yproject(j,r)=Data(j,r)+slacks(j,r);

Display eff, Lamres, slacks, xproject, yproject;

Can anyone help me? I would be very grateful.