aplan: Generate accelerated life test plans with specified...
In Auburngrads/SMRD: Statistical Methods For Reliability Data

Description Usage Arguments Details Value

Generate accelerated life test plans with specified characteristics.

APLAN(
  ap,
  b1p,
  b2p,
  thet1p,
  pvalp,
  knownp,
  idistp,
  ioptsp,
  ioptap,
  ioptmp,
  pifixp,
  zholdp,
  pmlimp,
  zp,
  pip,
  fpp,
  pqp,
  var,
  iprinp,
  ier
)

`ap`	Standardized intercept
`thet1p`	theta1 = sigmah/sigmad;
`pvalp`	Percentile of interest
`knownp`	`integer` specifying type of model (see details)
`idistp`	equals 1 for SEV/Weibull, 2 for Normal/Lognormal
`ioptsp`	option for lower stress (see details)
`ioptap`	option for allocation (see details)
`ioptmp`	option for the middle stress level (see details)
`pifixp`	middle allocation when ioptap=3
`zholdp`	fixed value of z when ioptsp=3
`pmlimp`	lower bound on pm when ioptmp=2
`bp`	Standardized slope = (muh-mud)/sigmad;

knownp = 1 for unknown theta1, 2 for known theta1, 3 for constant sigma quadratic model. ioptsp = 1 set low stress such that pmlim is failure prob at zl 2 optimize low stress level, 3 set low stress such that zl=zholdp 4 optimize low and middle stress levels ioptap = 1 equal allocation 2 equal expected number failing 3 optimize with fixed pim 4 optimize with e(rl)=r(rm); 5 optimize with e(rm)=r(rh); 6 4 2 1 relative allocation; 7 1 2 2 relative expected failures; 8 1 2 3 relative expected failures; 9 optimize low and middle; 10 optimize with pim=pih (as suggested by Wayne N.) ioptmp = 0 xm=(xl+xh)/2 1 fm=(fl+fh)/2 2 xm=(xl+xh)/2 if fm>pmlim and fm=pmlim otherwise 3 float

zp Length-3 vector of standardized stress levels pip Length-3 vector of proportionate allocations; fpp Length-3 vector of failure probabilities; pqp Length-3 vector equal to pip * fp var Variance of yhat(pvalp) iprinp Level of printing (0 for none, 4 for debug)