Rockton Plastics has made changes to its dividends during the past 14 years. Based on a target payout ratio of 30%, according to the Lintner Model, the firm would have preferred to make a different set of dividend changes. Both the actual and preferred dividend changes are shown in the following table. What "speed of adjustment" factor is implied by these two dividend change series? (Use of a regression program, such as one provided with a computer spreadsheet, is recommended.)

Preferred Change in Dividends Actual Change in Dividends Year $0.28 -0.47 -0.16 -0.08 -0.02 0.02 0.07 0.01 0.05 0.05 0.02 0.07 0.09 -0.05 0.01 0.01 0.04 0.01 0.03 0.03 0.01 0.04 0.03 0.03 10 0.06 12 13 0.05