Method of calibrating a compaction analyzer operably associated with a roller for rolling a roadway section , said method comprising: entering initial input parameters into the compaction analyzer ; making a plurality of passes with the roller over a portion of the roadway section ; applying a vibratory energy to the portion of the roadway section as the roller makes the plurality of passes; collecting the vibratory response signals of the roller on the portion of the roadway section to the applied vibratory energy; measuring the density of the portion of the roadway section at a plurality of locations thereon; characterized by : generating estimated density signals with the compaction analyzer based upon the vibratory response signals and the initial input parameters; calculating the difference between the measured densities and the estimated densities generated by the compaction analyzer at the plurality of locations; adjusting selected ones of the initial input parameters in the compaction analyzer based on the calculated difference; and generating adjusted density signals with the compaction analyzer based upon the vibratory response signals of the roller using the adjusted input parameters that will more closely approximate the actual density of the roadway section as it is rolled by the roller than do the estimated density signals. entering initial input parameters into the compaction analyzer ; making a plurality of passes with the roller over a portion of the roadway section ; applying a vibratory energy to the portion of the roadway section as the roller makes the plurality of passes; collecting the vibratory response signals of the roller on the portion of the roadway section to the applied vibratory energy; measuring the density of the portion of the roadway section at a plurality of locations thereon; characterized by : generating estimated density signals with the compaction analyzer based upon the vibratory response signals and the initial input parameters; calculating the difference between the measured densities and the estimated densities generated by the compaction analyzer at the plurality of locations; adjusting selected ones of the initial input parameters in the compaction analyzer based on the calculated difference; and generating adjusted density signals with the compaction analyzer based upon the vibratory response signals of the roller using the adjusted input parameters that will more closely approximate the actual density of the roadway section as it is rolled by the roller than do the estimated density signals. generating estimated density signals with the compaction analyzer based upon the vibratory response signals and the initial input parameters; calculating the difference between the measured densities and the estimated densities generated by the compaction analyzer at the plurality of locations; adjusting selected ones of the initial input parameters in the compaction analyzer based on the calculated difference; and generating adjusted density signals with the compaction analyzer based upon the vibratory response signals of the roller using the adjusted input parameters that will more closely approximate the actual density of the roadway section as it is rolled by the roller than do the estimated density signals. <EOS>