Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Wald-Wolfowitz Runs Test I01:17

Wald-Wolfowitz Runs Test I

The Wald-Wolfowitz test, also known as the runs test, is a nonparametric statistical test used to assess the randomness of a sequence of two different types of elements (e.g., positive/negative values, successes/failures). It examines whether the order of the elements in a sequence is random or if there is a pattern or trend present. This nonparametric test applies to any ordered data despite the population and sample data distribution, even if a higher sample size is available.
The test works...
Wald-Wolfowitz Runs Test II01:17

Wald-Wolfowitz Runs Test II

The Wald-Wolfowitz runs test, commonly referred to as the runs test, is a nonparametric test used to assess the randomness of ordered data. The test evaluates the number of runs, which are consecutive sequences of similar elements within the data. If the number of runs is significantly higher or lower than expected, the data is considered non-random, indicating a detectable pattern or structure.
For binary data, runs are identified using symbols such as + and −, or equivalently, 1s and 0s. In...
Friedman Two-way Analysis of Variance by Ranks01:21

Friedman Two-way Analysis of Variance by Ranks

Friedman's Two-Way Analysis of Variance by Ranks is a nonparametric test designed to identify differences across multiple test attempts when traditional assumptions of normality and equal variances do not apply. Unlike conventional ANOVA, which requires normally distributed data with equal variances, Friedman's test is ideal for ordinal or non-normally distributed data, making it particularly useful for analyzing dependent samples, such as matched subjects over time or repeated measures from...
One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation01:24

One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation

This lesson introduces two critical methods in pharmacokinetics, the Wagner-Nelson and Loo-Riegelman methods, used for estimating the absorption rate constant (ka) for drugs administered via non-intravenous routes. The Wagner-Nelson method relates ka to the plasma concentration derived from the slope of a semilog percent unabsorbed time plot. However, it is limited to drugs with one-compartment kinetics and can be impacted by factors like gastrointestinal motility or enzymatic degradation.
On...
Kruskal-Wallis Test01:19

Kruskal-Wallis Test

The Kruskal-Wallis test, also known as the Kruskal-Wallis H test, serves as a nonparametric alternative to the one-way ANOVA, offering a solution for analyzing the differences across three or more independent groups based on a single, ordinal-dependent variable. This statistical test is particularly valuable in scenarios where the data does not meet the normal distribution assumption required by its parametric counterparts. Kruskal-Wallis test is designed typically to handle ordinal data or...
Kohlraush’s Law and its Applications01:29

Kohlraush’s Law and its Applications

Kohlrausch's law explains that at infinite dilution, where dissociation is complete, each ion's contribution to the conductivity of the electrolyte is independent of the nature of other ions present in the solution. It also implies that when an electrolyte is highly diluted, the conductance of the electrolyte is the sum of the individual conductances of the ions it generates upon dissociation. The quantity of electricity an ion carries is proportional to its molar ionic conductance, which...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Effect of antibiotic treatment on the formation of non-spore Clostridium difficile persister-like cells.

The Journal of antimicrobial chemotherapy·2018
Same author

Geostatistical simulations for radon indoor with a nested model including the housing factor.

Journal of environmental radioactivity·2015
Same author

Definition of radon prone areas in Friuli Venezia Giulia region, Italy, using geostatistical tools.

Journal of environmental radioactivity·2014
Same author

Differential expression of interleukin-2 by anti-CD3-stimulated peripheral blood mononuclear cells in patients with psoriatic arthritis and patients with cutaneous psoriasis.

Clinical and experimental dermatology·2014
Same author

Body mass index as a risk factor for increased serum lactate during craniotomy.

Minerva anestesiologica·2013
Same author

[And yet there is a risk--do it yourself].

Giornale italiano di medicina del lavoro ed ergonomia·2013

Related Experiment Video

Updated: Jun 20, 2026

Semi-Automated Analysis of Peak Amplitude and Latency for Auditory Brainstem Response Waveforms Using R
06:01

Semi-Automated Analysis of Peak Amplitude and Latency for Auditory Brainstem Response Waveforms Using R

Published on: December 9, 2022

Analysis of the Lau effect using Walsh functions.

C Colautti, E E Sicre, M Garavaglia

    Optics Letters
    |September 12, 2009
    PubMed
    Summary

    Researchers explored the Lau effect using Walsh functions for optical spatial filtering. They derived resonance conditions and light intensity distributions, enabling a novel optical device.

    Area of Science:

    • Optics
    • Wave phenomena
    • Diffraction

    Background:

    • The Lau effect describes self-imaging of periodic structures under specific illumination conditions.
    • Diffracting apertures play a crucial role in shaping light patterns and enabling optical functionalities.

    Purpose of the Study:

    • To investigate an optical phenomenon analogous to the Lau effect using Walsh functions as diffracting apertures.
    • To derive the resonance conditions and light intensity distribution for this novel setup.
    • To demonstrate the implementation of a spatial-filtering optical device based on this approach.

    Main Methods:

    • Performing an optical experiment analogous to the Lau effect.
    • Utilizing Walsh functions as the diffracting apertures.
    • Deriving theoretical expressions for resonance conditions and intensity distribution.

    More Related Videos

    Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
    09:49

    Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

    Published on: April 16, 2014

    Related Experiment Videos

    Last Updated: Jun 20, 2026

    Semi-Automated Analysis of Peak Amplitude and Latency for Auditory Brainstem Response Waveforms Using R
    06:01

    Semi-Automated Analysis of Peak Amplitude and Latency for Auditory Brainstem Response Waveforms Using R

    Published on: December 9, 2022

    Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
    09:49

    Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

    Published on: April 16, 2014

    Main Results:

    • The experiment successfully demonstrated an effect analogous to the Lau effect with Walsh functions.
    • Equivalent resonance conditions and corresponding light intensity distributions were theoretically derived.
    • The derived principles were applied to implement a functional spatial-filtering optical device.

    Conclusions:

    • Walsh functions can be effectively employed as diffracting apertures in optical experiments similar to the Lau effect.
    • The theoretical framework for resonance conditions and intensity distribution is established for this configuration.
    • This research presents a viable method for creating spatial-filtering optical devices.