The paper topic is about the propagation of uncertainty in a multivariate measurement. The Law of Propagation of Uncertainty defined in the Guide to the Expression of Uncertainty in Measurement is used to calculate the standard uncertainties, covariance matrix and correlation coefficient. The procedure is presented for a set of samples, acquired from a balance platform, which are used to calculate the centre of pressure (COP) coordinates. The possibility of evaluating the uncertainty of COP results in different way is also discussed.

Keywords: balance platforms, centre of pressure, multivariate measurements, uncertainty