| standard deviation, s | A statistic that describes the dispersion or spread of a set of measurements about the mean value of a gaussian or normal distribution. calculated from the equation: |
| standard error of the mean, sx | A statistic which indicates the dispersion or spread of values for a mean of a set of measurements. standard deviation index, sdi. generally used in reports from proficiency testing (pt) surveys t... |
| standard uncertainty | Uncertainty of the results of a measurement expressed as a standard deviation. [iso] |
| state operations manual, som | Cms’s official document that provides guidelines for interpreting the clia regulations, as well as suggest probes for inspectors to use when reviewing a laboratory. |
| statistical control limits | As used with levey-jennings and westgard multirule types of qc procedures, these are the lines drawn on control charts to define the range of results expected due to the random error of the method... |
| statistically significant, statistically significant difference | A conclusion that the difference observed is larger than that expected due to chance (or the uncertainty or random error in the experimental data). the statement usually includes a probability lev... |
| systematic error, se | An error that is always in one direction and is predictable, in contrast to random errors that may be either positive or negative and whose direction cannot be predicted. |
| target measurement uncertainty | Measurement uncertainty formulated as a goal and decided on the basis of a specific intended use of measurement results. |
| target value, tv | Used in proficiency testing to designate the correct value, usually estimated by the mean of all participant responses, after removal of outliers, or by the mean established by definitive or refer... |
| total error | - Общая ошибка. сумма случайной и систематической ошибок. type i error
- Общая ошибка. см. error (ошибка).
- Общая ошибка. сумма случайной и систематической ошибок.
te; общая ошибка; |
| allowable total error |
tea; |
| test complexity | Refers to the clia system of classifying tests into categories on the basis of the difficulty of measurement and interpretation. categories include waived, provider performed microscopy, moderate ... |
| test method | - The method which is selected for experimental testing to validate its performance characteristics.
- The technical procedures and actions that are required to determine whether or not...
метод испытаний; метод испытания; |
| total error requirement | See allowable total error. |
| total error, te | The net or combined effect of random and systematic errors. |
| total imprecision | The random error observable over a period of many runs and many days. |
| total qc strategy | The balance of the efforts expended on statistical qc, preventive maintenance, instrument function checks, method performance tests, and quality improvement. |
| total testing process | Clia’s term for the entire testing process that includes pre-analytic, analytic, and post-analytic steps and procedures. |
| true value | - Generally used to indicate that this is the correct analytical concentration or result.
- Истинное значение tube, syn. test tube
- Истинное значение
- Истинное значе...
истинное значение; |
| trueness (of measurement) | Closeness of agreement between the average value obtained from a large series of test results and an accepted reference value. note: the measurement of trueness is usually expressed in terms of bi... |
| t-test | Often called student’s t-test. a statistical test of significance in which the difference between two mean values is tested. the null hypothesis is that there is no difference between the two mean... |
| t-value, t | A statistic from the t-test. it is a ratio of a systematic error component divided by a random error component [bias/(sdiff/n1/2)]. |
| waived tests | A specific category of tests defined by clia, such as dipstick tests, fecal occult blood, urine pregnancy tests, erythrocyte sedimentation rates, blood glucose monitoring devices, etc., which are ... |
| westgard rules, westgard multi-rule control procedure | A control procedure that uses a series of control rules to test the control measurements. a 12s rule is used as a warning, followed by use of 13s, 22s, r4s, 41s, and 10x as rejection rules. |
| where n is the number of measurements, and xi is an individual measurement |
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| which the manufacturer has measured the values expected for different tests and different methods these bottle values are summarized on assay sheets and are useful for selecting control materials, however, they should not generally be used for setting t |
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| within-laboratory precision | Precision over a defined time and operators, calibration and reagents may vary within the same facility and using the same equipment. note: formerly, the term total precision was used. [clsi ep15-... |
| within-run imprecision | The random error observable within the time period of a single analytical run. |
| z-score, z-value | A calculated number that tells how many standard deviations a control result is from its mean value, e.g., a control result of 112 on a material having a mean of 100 and a standard deviation of 5 ... |
