function error = lsqError(parameter, x, y)
% Objective function for fitting a exponential equation to data.
%
% Arguments: parameter, vector containing the parameters for the exp. decay
%            x, vector of the input values
%            y, vector of the corresponding measured output values
%
% Returns: the estimation error in terms of the mean sqaure error

  y_est = exponentialDecay(parameter, x);
  error = meanSquareError(y, y_est);
end