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2. Logarithmic scale - Wikipedia

   en.wikipedia.org/wiki/Logarithmic_scale

   Logarithmic scale. A logarithmic scale (or log scale) is a method used to display numerical data that spans a broad range of values, especially when there are significant differences between the magnitudes of the numbers involved. Unlike a linear scale where each unit of distance corresponds to the same increment, on a logarithmic scale each ...

3. Log–log plot - Wikipedia

   en.wikipedia.org/wiki/Log–log_plot

   Comparison of Linear, Concave, and Convex Functions\nIn original (left) and log10 (right) scales. In science and engineering, a log–log graph or log–log plot is a two-dimensional graph of numerical data that uses logarithmic scales on both the horizontal and vertical axes. Power functions – relationships of the form – appear as straight ...

4. Work sampling - Wikipedia

   en.wikipedia.org/wiki/Work_sampling

   Work sampling. Work sampling is the statistical technique used for determining the proportion of time spent by workers in various defined categories of activity (e.g. setting up a machine, assembling two parts, idle…etc.). [ 1] It is as important as all other statistical techniques because it permits quick analysis, recognition, and ...

5. Natural logarithm - Wikipedia

   en.wikipedia.org/wiki/Natural_logarithm

   The natural logarithm of e itself, ln e, is 1, because e1 = e, while the natural logarithm of 1 is 0, since e0 = 1. The natural logarithm can be defined for any positive real number a as the area under the curve y = 1/x from 1 to a[4] (with the area being negative when 0 < a < 1). The simplicity of this definition, which is matched in many ...

6. Logrank test - Wikipedia

   en.wikipedia.org/wiki/Logrank_test

   Logrank test. The logrank test, or log-rank test, is a hypothesis test to compare the survival distributions of two samples. It is a nonparametric test and appropriate to use when the data are right skewed and censored (technically, the censoring must be non-informative). It is widely used in clinical trials to establish the efficacy of a new ...

7. Log-normal distribution - Wikipedia

   en.wikipedia.org/wiki/Log-normal_distribution

   In probability theory, a log-normal (or lognormal) distribution is a continuous probability distribution of a random variable whose logarithm is normally distributed. Thus, if the random variable X is log-normally distributed, then Y = ln (X) has a normal distribution. [2][3] Equivalently, if Y has a normal distribution, then the exponential ...