set

i Produkte /A,B,C/

parameters

c(i) cost / A 10, B 5, C 15/

sigmaltd(i) sigma / A 5, B 6, C 7/

mu(i) mu / A 20, B 30, C 40/;

scalar

mut mutotal

ASLn Average service level /0.90/;

mut = sum(i, mu(i));

free variable

O object

z(i) standardized score for product i

MSLn(i) minimum service level

;

equations

Ob object

ASL ASLfunction

MSL MSLfunction

;

ob… O =E= sum(i, c(i)*z(i)*sigmaltd(i));

ASL… sum(i ,(mu(i)/mut)*errorf(z(i))) =G= ASLn;

MSL(i)… errorf(z(i)) =G= MSLn(i);

model inventory /all/;

solve inventory using nlp minimizing O;

Where are the failure? I have a avarage servicelevel about 90%. Why I get for Product A a minimum service level about 37,5 %?

This are the original model:

http://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1932&context=theses

p.39, 5.1 Model One for Type 1 Service Level Constraints

why I dont get the minimum service level?

regards

timi

–

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Hi timi !

What exactly is wrong with your results ? What aspect of the solution

found is unsatisfying for you ?

Regards

Claudio

On Wed, Jan 29, 2014 at 3:00 PM, Timion wrote:

set

i Produkte /A,B,C/

parameters

c(i) cost / A 10, B 5, C 15/

sigmaltd(i) sigma / A 5, B 6, C 7/

mu(i) mu / A 20, B 30, C 40/;

scalar

mut mutotal

ASLn Average service level /0.90/;

mut = sum(i, mu(i));

free variable

O object

z(i) standardized score for product i

MSLn(i) minimum service level

;

equations

Ob object

ASL ASLfunction

MSL MSLfunction

;

ob… O =E= sum(i, c(i)*z(i)*sigmaltd(i));

ASL… sum(i ,(mu(i)/mut)*errorf(z(i))) =G= ASLn;

MSL(i)… errorf(z(i)) =G= MSLn(i);

model inventory /all/;

solve inventory using nlp minimizing O;

Where are the failure? I have a avarage servicelevel about 90%. Why I get

for Product A a minimum service level about 37,5 %?

This are the original model:

http://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1932&context=theses

p.39, 5.1 Model One for Type 1 Service Level Constraints

why I dont get the minimum service level?

regards

timi

–

“gamsworld” group.

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email to gamsworld+unsubscribe@googlegroups.com.

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