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v ) Consumer durables The technique for deriving stock values of consumer durables parallels that for reproducible fixed assets . All previous techniques given in the literature for deriving loop invariants are heuristic in nature and are not complete in any sense . In such instances , relative importance ratios are used as weights to combine relative changes in prices of the selected components over specified periods.For a description of the procedure for deriving index weights from consumer expenditure data , see chapter 16 , Consumer Expenditures and Income and chapter 17 , The Consumer Price Index in BLS Handbook of Methods . The goals are to increase providers ' ability to transition from quality measurement to actual changes in clinical practice , and to improve methodology for deriving quality measures from readily available data .