Estimation means making an educated guess or calculation about something when we don't have the exact information. It's like giving an approximate idea or value based on what we know or observe. Full definition
Along these lines, swelling results in loss of estimation of cash. (teenanalyst.com)
Of course, better technology may increase the accuracy of predictions but serious errors in estimation of availability of reserves have been known to happen. (financialtrading.com)
Combining various data sets may allow for estimation of the systematic errors. (judithcurry.com)