The present invention provides a resist pattern thickening material and the like which can thicken a resist pattern and form a fine space pattern. The method for estimating a state parameter has the steps of predicting a state parameter at a current time using an estimated state parameter at a previous time and a system dynamics; and estimating an optimal state parameter at the current time from the state parameter predicted in the step and a system output parameter measured at the current time, using a geometric data fusion method. In some embodiments, such diester-based lubricants are derived from FT olefins and fatty acids. The context memories are operatively coupled to the pipeline stages and store information relating to a state of reordering for each of the sources.