Applying the three-period moving average method on the Real Home Price Index the following forecasting results are produced. The value of mean absolute deviation is Year Real Home Price Index Ft A-FA-F (A-F)2 1946 106.5058955 1947 109.3296707 1948 101.2225795 1949 100.0466076 1950 105.8948393 1951 103.8986687 1952 103.9743275 1953 114.7133093 1954 114.199126 1955 115.4621261 105.6860486 -5.63944 5.639441 103.5329526 2.361887 2.361887 5.578509 102.3880088 1.51066 1.51066 2.282093 103.2800385 0.694289 0.694289 0.482037 104.5892785 10.12403 10.12403 102.496 107.5287685 6.670358 6.670358 110.9622543 4.499872 4.499872 31.80329 44.49367 20.24885 1956 115.3166155 114.7915205 0.525095 0.525095 0.275725 SUM 32.02563 207.6602 2.91 25.96 4.00 18.88