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For 2015, the gathering period is January 1, 2013, through June 30, 2014. This changes all raw sale prices, prior to June 30, 2014, to reflect the market value as of that date.Time Adjustment MethodologyWhen price levels are changing significantly, sales prices must be adjusted for time. Separate time adjustment factors, by type of property and geographic area, may be necessary as rates of change in real estate prices often vary with these factors. Most appraisal organizations, such as the Appraisal Institute (Institute) and the International Association of Assessing Officers (IAAO), recognize the need for time adjustment (trending) of sales prices to the date of appraisal.Determination of market adjustments for time involves the consideration of the four basic techniques of time trend analysis: