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Related Concept Videos

Power01:08

Power

The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
Testing a Claim about Population Proportion01:24

Testing a Claim about Population Proportion

A complete procedure for testing a claim about a population proportion is provided here.
There are two methods of testing a claim about a population proportion: (1) Using the sample proportion from the data where a binomial distribution is approximated to the normal distribution and (2) Using the binomial probabilities calculated from the data.
The first method uses normal distribution as an approximation to the binomial distribution. The requirements are as follows: sample size is large...
Power in a Three-Phase Circuit01:15

Power in a Three-Phase Circuit

Three-phase systems have two configurations: the wye and delta. A star configuration can be three or four wires; in a delta configuration, the components are connected in a closed loop. Instantaneous power refers to the power value at a precise moment, and in a balanced three-phase system, it is constant. This is because the sum of the instantaneous powers in the three phases remains steady over time, despite individual fluctuations, due to the symmetry and phase relationship. The total...
Sums of Power01:22

Sums of Power

In definite integration, Riemann sums approximate the area under a curve by dividing it into subintervals and summing the areas of rectangles. When these approximations follow predictable numerical patterns, such as arithmetic or polynomial sequences, sum formulas offer a more efficient and accurate way to compute the result. In particular, the sum of consecutive integers, squares, and cubes plays an essential role in simplifying these calculations, especially when dealing with uniform...
Average Power01:13

Average Power

In practical electrical applications, the concept of time-varying instantaneous power is not frequently utilized. Instead, focus shifts to the more practical quantity known as average power. Average power is determined by integrating the instantaneous power over a specified time period and subsequently dividing it by that duration.
Power Dissipated in a Circuit: Problem Solving01:15

Power Dissipated in a Circuit: Problem Solving

The equivalent resistance of a combination of resistors depends on their values and how they are connected.
The simplest combinations of resistors are series and parallel connections. In a series circuit, the first resistor's output current flows into the second resistor's input; therefore, each resistor's current is the same. Thus, the equivalent resistance is the algebraic sum of the resistances. The current through the circuit can be found from Ohm's law and is equal to the battery's emf...

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Related Experiment Video

Updated: Jun 12, 2026

The Power of Interstimulus Interval for the Assessment of Temporal Processing in Rodents
10:27

The Power of Interstimulus Interval for the Assessment of Temporal Processing in Rodents

Published on: April 19, 2019

A simple method for calculating power based on a prior trial.

George F Borm1, Bastiaan R Bloem, Marten Munneke

  • 1Department of Epidemiology, Biostatistics and HTA, Radboud University Nijmegen Medical Centre, Geert Grooteplein 21, Nijmegen, The Netherlands. g.borm@ebh.umcn.nl

Journal of Clinical Epidemiology
|June 25, 2010
PubMed
Summary
This summary is machine-generated.

Calculating clinical trial power is now simpler. A new method uses only the P-value from a previous similar study, making power calculations feasible even with limited data.

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Area of Science:

  • Biostatistics
  • Clinical Trial Design
  • Statistical Inference

Background:

  • Clinical trial power calculations often require detailed data from previous studies, which may not be fully reported.
  • Standard power calculations can be difficult or impossible when only summary statistics like standard deviations of baseline and follow-up measurements are available, or when complex analyses are planned.

Purpose of the Study:

  • To develop a method for determining the statistical power of a planned clinical trial using minimal information from a prior reference trial.
  • To enable power calculations when detailed outcome data from a previous study is insufficient.

Main Methods:

  • Investigated power calculations across various statistical methods, including t-tests, ANOVA, regression models (linear, logistic, Poisson), and non-parametric tests (Wilcoxon, logrank).
  • Developed a novel method to estimate power based on summary statistics from a reference study.

Main Results:

  • A method was successfully developed to calculate the power of a clinical trial.
  • This method relies solely on the P-value or confidence interval derived from the outcome of a reference study.

Conclusions:

  • Power calculations for clinical trials can be effectively performed using only the P-value from a similar, earlier trial.
  • This approach simplifies power estimation, especially when detailed data from prior studies is unavailable.