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 ?
As a simple example of the application of the PDfR concept, let us address a device whose MTTF during steady-state operation is described by the Boltzmann-Arrhenius equation, and assume that the exponential law of reliability is applicable.
The Markov model in is the basis for the reliability function and MTTF of the subsystem:
Pressure Indicator (PI-9932) As Well As As Well As Pressure Table 6: Criteria Likelihood entire three-phase separator system PV-9900 Instrument MTTF (Jam) Likelihood Kriteria Likelihood SDV-9904 16936 2.59 E OLT-9934 25416 1,72 E LIC 9935 19404 2.26 D PSV-9931 21888 2,001 D PSV-9932 21888 2,001 D TT-9939 21888 2,001 D PCV-9947A 14584 3,003 C BDV-9961 21888 2,001 D TT-9969 21888 2,001 D Table 7: Criteria consequences three-phase separator system PV-9900 No.
Resultados del sistema 1 MTTF [Ano/Falla] 3,18 [lambda] [Falla/Ano] 0,31 MTTR [Ano/Rep.] 0,0000018 [my] [Rep./Ano] 556352,8 Disponibilidad 0,99 Indisponibilidad 0,00040 Frecuencia de falla 0,31 LOLP 0,00039 LOLE 3,47 Tabla IX.
Finally, the regression technique enables prediction of the future availability values of both main papermaking machines (M1 and M2) using the OEE indicators of each papermaking machine and its MTTF, such as average runtime before failure.
By means of the MTTF, MTTR, and the fault model, a fault injection system was designed to study the resulting traffic flow of a DTN based on CGR algorithm under failure conditions.
Overall Data Comparison: The results are verified by comparing the actual and predicted total number of defects by Defect-Type including the Total for the entire period TI(1)-TI(15), with the corresponding actual defects; The MTTF is also compared.
The bonds are special obligations payable by state taxes deposited in the pledged amounts account from MTTF and MMTOA receipts, subject to annual legislative appropriation.
And the reliability, safety and MTTF of the interlocking system of the two structures are compared by the experimental results of the hot standby structure, the three take two and two by two take two.
8) Get summarized expressions R, MTTR, and MTTF, solving formulas (1), (2), and (3).
Based on the ISO-14224 standard, iQRA supports critical decision-making by giving users the ability to benchmark their reliability figures against a global dataset and extract safety critical element (SCE) failure statistics and mean-time-to failure (MTTF) data.
In this way different rates of the converter are improved such as: Mean Time to Failures (MTTF) and Mean Time between Failures (MTBF).