20. The system according to claim 2 , wherein the first not fully specified data record does not include a second numeric data value for a second variable of the plurality of variables and does include a third numeric data value for a third variable of the plurality of variables, and wherein the obtaining comprises obtaining, using the mathematical model and at least one optimization technique, the first numeric data value and the second numeric data value based on the third numeric data value.
20. The system according to claim 2 , wherein the first not fully specified data record does not include a second numeric data value for a second variable of the plurality of variables and does include a third numeric data value for a third variable of the plurality of variables, and wherein the obtaining comprises obtaining, using the mathematical model and at least one optimization technique, the first numeric data value and the second numeric data value based on the third numeric data value. 34. The system according to claim 20 , wherein the first not fully specified data record includes a fourth numeric data value for a fourth variable of the plurality of variables, and wherein obtaining the first and second numeric data values comprises using the fourth numeric data value as a search constraint in the optimization technique.