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  2. Combat results table - Wikipedia

    en.wikipedia.org/wiki/Combat_results_table

    Less often, the columns may be based on the difference between the combatants' strengths, rather than the ratio (for example '3', if an attacker with strength 5 attacks a defender with strength 2). A die roll is then made using one or more dice and the resulting number is then cross-referenced on the table to find the results of the individual ...

  3. x̅ and R chart - Wikipedia

    en.wikipedia.org/wiki/X̅_and_R_chart

    As with the ¯ and s and individuals control charts, the ¯ chart is only valid if the within-sample variability is constant. [4] Thus, the R chart is examined before the x ¯ {\displaystyle {\bar {x}}} chart; if the R chart indicates the sample variability is in statistical control, then the x ¯ {\displaystyle {\bar {x}}} chart is examined to ...

  4. Cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Cutoff_frequency

    As a voltage ratio this is a fall to / of the passband voltage. [1] Other ratios besides the 3 dB point may also be relevant, for example see § Chebyshev filters below. Far from the cutoff frequency in the transition band, the rate of increase of attenuation ( roll-off ) with logarithm of frequency is asymptotic to a constant.

  5. Alpha cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Alpha_cutoff_frequency

    Alpha cutoff frequency, or is the frequency at which the common base DC current gain drops to 0.707 of its low frequency value. The common base DC current gain is the ratio of a transistor's collector current to the transistor's emitter current , or α = i C i E {\displaystyle \alpha ={\frac {i_{C}}{i_{E}}}} .

  6. Spatial cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Spatial_cutoff_frequency

    where is the wavelength expressed in millimeters and F # is the lens' focal ratio. As an example, a telescope having an f /6 objective and imaging at 0.55 micrometers has a spatial cutoff frequency of 303 cycles/millimeter. High-resolution black-and-white film is capable of resolving details on the film as small as 3 micrometers or smaller ...

  7. Regression discontinuity design - Wikipedia

    en.wikipedia.org/wiki/Regression_discontinuity...

    In statistics, econometrics, political science, epidemiology, and related disciplines, a regression discontinuity design (RDD) is a quasi-experimental pretest–posttest design that aims to determine the causal effects of interventions by assigning a cutoff or threshold above or below which an intervention is assigned.

  8. Percentile - Wikipedia

    en.wikipedia.org/wiki/Percentile

    For example, the 50th percentile (median) is the score below (or at or below, depending on the definition) which 50% of the scores in the distribution are found. A related quantity is the percentile rank of a score, expressed in percent , which represents the fraction of scores in its distribution that are less than it, an exclusive definition.

  9. Open-circuit time constant method - Wikipedia

    en.wikipedia.org/wiki/Open-circuit_time_constant...

    Figure 2 illustrates the approximation. The x-axis is the ratio τ 1 / τ 2 on a logarithmic scale. An increase in this variable means the higher pole is further above the corner frequency. The y-axis is the ratio of the OCTC (open-circuit time constant) estimate to the true time constant.

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