An appraisal of methods for estimation service lives of utility properties: February 14, 1942
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Forecast Methods of Estimating Service Life IV
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accounting accrued depreciation actuarial analysis actuarial methods American Gas Association annual plant Annual Rate Method annual retirements Appendix application assumption Asymptotic Limiting Ratio band basic data causes of retirement Column DEPRECIATION COMPUTATIONS depreciation reserve derived determined developed Edison Electric Institute Electric Meters estimates of service estimating service expected remaining factors figures future group of meters growth Half-Cycle Ratio Method illustrate installations Iowa Iowa State College limiting value mathematical mortality characteristics Observed Survivor Table obtained plant balance practice present worth basis probable average service property group property in service reasonably represents retirement ratios service lives shows significance simple annual ratios smooth statistical methods stub curve survival ratios survivor curve Table and Chart trend turnover methods turnover principle TYPE CURVES uniform usually utility property vintage Water Gas Sets