"Parameter values" refers to specific numbers or values that are assigned to variables in a mathematical or scientific equation. These values help define the characteristics or behavior of the equation and determine its outcome. Full definition
Perhaps uncertainty across multiple model runs using a range of different parameter values? (forestsnews.cifor.org)
Essentially, they ignore the variation with parameter values of relative volumes in parameter space and in data space. (climateaudit.org)
They investigated using different parameter values in the model and exploring the variation in the result and found a great deal of variation in ice mass loss rates was possible. (antarcticglaciers.org)