Ayant comme paramètre d'entrée (input) le volume d'eau brute (m3) arrivant en tête de station et comme autre paramètre d'entrée la capacité théorique de traitement en équivalent habitant. Aussi on a comme paramètre de sorti (output) le volume d'eau traitée (m3). Ma question est, comment ajuster les capacités en fonction des volumes à l'entrée et à la sortie en utilisant la méthode DEA. J'ai essayé mais les résultats me paraissent anormale pour quelques cas aussi j'aimerais n'ajuster que le paramètre capacité.
Je m'explique, le volume à la sortie doit obligatoirement être inférieur au volume à l'entrée or dans mes résultats j'ai constaté que j'ai des cas ne répondant pas à cette règle après ajustement.
Dans l'interprétation, dois-je prendre en compte ces résultats ou dois-je éliminer à l'avance ces DMU ? Merci par avance.
Ok Dr Saeed Assani here is the question from google translate.
How to adjust the capacity of treatment plants using the DEA method?
Having as input parameter the volume of raw water (m3) arriving at the head of the station and as another input parameter the theoretical treatment capacity in inhabitant equivalent. Also we have as an output parameter the volume of treated water (m3). My question is, how to adjust the capacities according to the volumes at the entry and at the exit using the DEA method. I tried but the results seem abnormal for a few cases so I would like to adjust only the capacity parameter.
Let me explain, the volume at the exit must obligatorily be lower than the volume at the entry or in my results I noted that I have cases not answering this rule after adjustment.
In the interpretation, should I take these results into account or should I eliminate these DMUs in advance? Thanks in advance.
After learning about the DEA method, I have just set up my model as follows: inputs a single parameter which is the treatment capacity, for the outputs I used two parameters the volume of water treated and the average concentration of the BOD5 at the exit. I put an input orientation and a variable return to scale, does that seem logical?
Thank you Dr Saeed Assani for answer but really I would like to adjust capacity which is an input parameter by the outputs parameters because capacity is theoricall and the outputs are real.
Dr Saeed Assani thank you for your time and patience but the choice is already made, I cannot change it during my doctoral thesis. I raise my basic question again; the capacity is taken from the calculation note based on poullution parameters. After a few years of exploitation, we realized that the basic pollution parameters data for calculating the capacity were overestimated so we decided to review the capacity of each station using the DEA. This is why orientation is output in order to correct the capacities according to the pollution loads which are BOD5, COD, MES and incoming water flow.