Downloaded from https://www.everyspec.com AMCP 700-19 TAILE 3.3 OOMPARIUONS1 BETWEEN ATTRIBUTE$ AND VARIABLES TISTING Variables Variables Pauft AtwV&Aibu lathe then lite) ULsf Tew) Urn of lom Single operation, Single operation. Repetitive or continuous "pration over tiMe. Type of Number or fraction Distribution of somo quan. Distribution of Whime over time, Information of sample that failed titative output at a given Yielded to Meet specifiud point in time, Proidaso quality character. most information f or quel. stiecs at a given ity Improvement. point In tirme Reliability Praction-defoctive or Output tolerance limit.
Mean life, failure rate, or probability Goal prabobilityof~iur- which define success or of survival for a fixed Vivi' Period, vivel over a fixed failure Possibly applying tima period, after a fixed period of opetration, Sample Size Usually highest. Usually lower than attributes, Lower than attributes test for for Given test W, correspondingj plan, corresponding plan, Protectionl Ease of Requires relativelV More climplex test equip. Continuous observation necessary Inspection simple test equip ment and tetter trained f or most types of tests, Highly mant and loss. people required thean for trained people required, Difficult qualihlad p.,.san- attribute tests. to maintain cotitrolled test con.
nol. ditlons. simplicity Data recording and More clerical costs then More clerical costs than attribute of analysis is fairly attiabute plant. Varl. plans.. His one sot of oitelria for Appieation simple. Single tet of able* criteria needed for all quality chaercterlstaio. attributes criteria each quality character. applies to all quality Istic, charac teristics. St #'S 1 tical No assumotions on Often requires a parametric Usually requires an asaumption of Consldore- failure distribution assumption on the distribu. a time-to-folitnad distmbk~tlon, tions required. Binomial tion of the characteristic Tables ovalabla for jxponmntlal distribution applies considered, ORef.
81 and Welbull distributions. (Refs, tar most earns. ix. Veand In) tensal" tables art avuilebie. (Hots Oe Rif, t12 for nongwersmetria teoansmd Ref. 20 for a general dleuueln" of relleblilky and life touts.