Title: 18_4 Errors and Percentage Change
Course: HELM Workbooks 2023-2024 > Section: HELM 18: Functions of Several Variables

When one variable is related to several others by a functional relationship it is possible to estimate the percentage change in that variable caused by given percentage changes in the other variables. For example, if the values of the input variables of a function are measured and the measurements are in error, due to limits on the precision of measurement, then we can use partial differentiation to estimate the effect that these errors have on the forecast value of the output.