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  2. Kaplan–Meier estimator - Wikipedia

    en.wikipedia.org/wiki/Kaplan–Meier_estimator

    An example of a Kaplan–Meier plot for two conditions associated with patient survival. The Kaplan–Meier estimator, [1] [2] also known as the product limit estimator, is a non-parametric statistic used to estimate the survival function from lifetime data. In medical research, it is often used to measure the fraction of patients living for a ...

  3. National Council Licensure Examination - Wikipedia

    en.wikipedia.org/wiki/National_Council_Licensure...

    The NCSBN was created in 1978 and took ownership of the SBTPE, and in 1982, replaced the SBTPE with NCLEX. The NCLEX, which was at the time a test administered using paper and pencil, decreased the total number of questions from 720 to 480 (including up to 75 pilot questions, which had no bearing on the final score).

  4. Hazard ratio - Wikipedia

    en.wikipedia.org/wiki/Hazard_ratio

    The curve represents the odds of an endpoint having occurred at each point in time (the hazard). The hazard ratio is simply the relationship between the instantaneous hazards in the two groups and represents, in a single number, the magnitude of distance between the Kaplan–Meier plots. [7] Hazard ratios do not reflect a time unit of the study.

  5. Logrank test - Wikipedia

    en.wikipedia.org/wiki/Logrank_test

    The logrank test statistic compares estimates of the hazard functions of the two groups at each observed event time. It is constructed by computing the observed and expected number of events in one of the groups at each observed event time and then adding these to obtain an overall summary across all-time points where there is an event.

  6. Prediction interval - Wikipedia

    en.wikipedia.org/wiki/Prediction_interval

    The prediction interval is conventionally written as: [, +]. For example, to calculate the 95% prediction interval for a normal distribution with a mean (μ) of 5 and a standard deviation (σ) of 1, then z is approximately 2. Therefore, the lower limit of the prediction interval is approximately 5 ‒ (2⋅1) = 3, and the upper limit is ...

  7. Kaplan, Inc. - Wikipedia

    en.wikipedia.org/wiki/Kaplan,_Inc.

    Kaplan, Inc. was founded in 1938 by Stanley H. Kaplan, a first-generation son of immigrants [4] who began tutoring his classmates at age 14, operating from the basement of his parents' Brooklyn home. [5]

  8. Nottingham Prognostic Index - Wikipedia

    en.wikipedia.org/wiki/Nottingham_Prognostic_Index

    The Nottingham prognostic index (NPI) is used to determine prognosis following surgery for breast cancer. [1] [2] Its value is calculated using three pathological criteria: the size of the tumour; the number of involved lymph nodes; and the grade of the tumour. [1]

  9. Coefficient of determination - Wikipedia

    en.wikipedia.org/wiki/Coefficient_of_determination

    Ordinary least squares regression of Okun's law.Since the regression line does not miss any of the points by very much, the R 2 of the regression is relatively high.. In statistics, the coefficient of determination, denoted R 2 or r 2 and pronounced "R squared", is the proportion of the variation in the dependent variable that is predictable from the independent variable(s).

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