reliability

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reliability

 [re-li″ah-bil´ĭ-te]
1. in statistics, the tendency of a system to be resistant to failure.
2. precision (def. 2).

re·li·a·bil·i·ty

(rē-lī'ă-bil'i-tē),
The degree of stability exhibited when a measurement is repeated under identical conditions. See: correlation coefficient, reliability coefficient.
[M.E. relien, fr. O.Fr. relier, fr. L. religo, to bind]

reliability

Statistics The extent to which the same test or procedure will yield the same result either over time or with different observers. See Interrater reliability, Test-retest reliability.

re·li·a·bil·i·ty

(rĕ-lī'ă-bil'i-tē)
Repeatability; ability of a test to be repeated by several testers and produce the same result.
[M.E. relien, fr. O.Fr. relier, fr. L. religo, to bind]

reliability 

The extent to which multiple measurements of the same thing, made on separate occasions, yield approximately the same results. The reliability between two sets of scores can be assessed by determining the correlation coefficient (test-retest reliability coefficient). See validity.

re·li·a·bil·i·ty

(rĕ-lī'ă-bil'i-tē)
Degree of stability exhibited when a measurement is repeated under identical conditions.
See: correlation coefficient
[M.E. relien, fr. O.Fr. relier, fr. L. religo, to bind]

Patient discussion about reliability

Q. How easy is it to tell about the baby’s birth date? Is it reliable? Hi everyone! My sister is being diagnosed as pregnant. She has a very regular menstrual cycle and her hormone levels are good. How easy is it to tell about the baby’s birth date? Is it reliable?

A. My friend got the due date of birth by doctor and it goes very near by, just the difference was for 5 days from the date. Since you have very regular menstural cycle, it would be easy for the doctors to calculate the birth date. And you can rely on the birth date being calculated by the doctors. It can be calculated easily. You need to find the 1st day of your last period then count back 3 months and add 7 days. Now you get your date.

Q. Can someone…clarify which is the best and reliable one? Hi I am 23 years woman............ I am confused with the different type of tests and diagnosis my friend is having as she is being suspected for breasts cancer. Can someone…clarify which is the best and reliable one?

A. Please understand that all the tests that are being carried out are reliable and it would entirely depend upon the requirement and treatment stages. They would also depend upon age groups , stages of cancer etc. In general the different types are: clinical breast examination done by the clinicians in a clinic. Mammogram, which are special X-ray to check abnormal growth changes in the breast tissues. Chance of cyst to be confused by breast cancer is resolved by ultrasound. To check if the particular tissue is cancerous is done by breast biopsy.

Q. What are the tests and steps involved in diagnosis of breast cancer and are all tests reliable?

A. First symptoms are looked for----- as a lump and pain associated with it and any redness or any nipple discharge. They also look for the medical history and if found for any possibility then it’s evaluated by mammography, but for woman it can give wrong result as they have dense breasts but for men it is well diagnosed. If any breast abnormalities are found during mammography they are confirmed with ultrasound and for women patients this is a better option. For women and symptom evident men for nipple discharge are also looked for nipple discharge test. But these tests do not confirm a cancer and for confirmation a biopsy is required followed by lab test on those biopsy samples. Biopsy is removing of body tissue for further cancer confirmative lab tests which is generally looking under a microscope to indentify the cell type and the type of cancer is known. Their reliability is based on the person operating the instrument and his experience.

More discussions about reliability
References in periodicals archive ?
MTBF/MTBF + MTTR = 0.1593625498/0.1593625498 + 0.0025000000 = 0.98455479663 [approximately equal to] 0.99.
Nomenclature [P.sub.ij] process time of jth job for ith operation BL breakdown level MTTR mean time to repair MTBF mean time between failures PC part complexity PM part mix P[I.sub.i] performance index P[I.sub.0] the minimum performance index obtained by using the individual dispatching rules J/M job to machine ratio p mean process time of job type M number of machines [U.sub.s] shop utilization C due date allowance factor [A.sub.i] arrival time of job i at the shop floor [lambda] inter arrival time PM part mix [r.sub.ij] normalized criteria / attribute value [w.sub.j] relative weight of the jth criterion [OMEGA]b set of benefit criteria [OMEGA]c sets of cost criteria [S.sub.ij] value of jth performance measure using ith dispatching rule ([R.sub.i]) DOI: 10.2507/26th.daaam.proceedings.057
The MTTR for Asym-ACH and Sym-ACH are [N.sup.2] - N + 1 and 6n[N.sup.2], respectively.
In general, the MTTR with the HS-GRSP scheme is the same as the length of the rendezvous sequence.
Machine breakdown level (BLs) is defined by the ratio of MTTR over the sum of MTTR and MTBF.
Depending on the combination of the channels of nodes A and B, the maximum TTR varies usually between m/2 and (m/3) (m = [absolute value of [PHI]), where the average MTTR is lower than 30 slots in all cases, varying usually between m/3 and m/4.
In this paper MTTF is used for the repairable system since MTTR is considered separately, so
From the equations shown above and Table 1, we see that there are five important factors to define the "reliability" of a system; MTBF, MTTR, availability, reliability and time.
Therefore, each type of failure can be assigned with an MTTR (Mean Time To Repair) value, based e.g.
"Using our leading edge Resolve platform as a foundation, and leveraging our extensive experience with network engineering groups, we're reducing the amount of human interaction required for effective event and incident management, while setting new standards for MTTR and operational efficiency."
Planned (expected) availability = MTBF / (MTBF+ + MTTR) (2)
El MTTR (mean time to repair) se ha calculado como la esperanza matematica de la duracion de reparacion.