Design of experiments

Quasi-experiment

A quasi-experiment is an empirical interventional study used to estimate the causal impact of an intervention on target population without random assignment. Quasi-experimental research shares similarities with the traditional experimental design or randomized controlled trial, but it specifically lacks the element of random assignment to treatment or control. Instead, quasi-experimental designs typically allow the researcher to control the assignment to the treatment condition, but using some criterion other than random assignment (e.g., an eligibility cutoff mark). Quasi-experiments are subject to concerns regarding internal validity, because the treatment and control groups may not be comparable at baseline. In other words, it may not be possible to convincingly demonstrate a causal link between the treatment condition and observed outcomes. This is particularly true if there are confounding variables that cannot be controlled or accounted for. With random assignment, study participants have the same chance of being assigned to the intervention group or the comparison group. As a result, differences between groups on both observed and unobserved characteristics would be due to chance, rather than to a systematic factor related to treatment (e.g., illness severity). Randomization itself does not guarantee that groups will be equivalent at baseline. Any change in characteristics post-intervention is likely attributable to the intervention. (Wikipedia).

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Experiments A Cappella

A short a cappella tribute to experimentalists. It is sung while performing three simple experiments with household items: Mentos dropped in diet Coke, a tea bag emptied and burned, and a ping pong ball floating in the air stream of a hair dryer.

From playlist Science Experiments!

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From playlist physics

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This experiment with a mirror shows you a very common illusion that magicians and illusionists often mislead us with. This is physics experiment for science project.

From playlist OPTICS

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From playlist Science Unplugged: Physics

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From playlist physics

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In this video i demonstrate photoelectric effect. I explain the effect and i show the Einstein equation! Enjoy!

From playlist ATOMIC PHYSICS

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From playlist Seminar In the Analysis and Methods of PDE (SIAM PDE)

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From playlist Engineering MAE 91. Intro to Thermodynamics

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Quantum Phases of Matter XXII - Fractionalized metallic phases in the single band - Subir Sachdev

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From playlist The Quantum Phases of Matter by Subir Sachdev

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From playlist Hydrodynamics and fluctuations - microscopic approaches in condensed matter systems (ONLINE) 2021

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From playlist Optimization tutorial

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Quantum Transport, Lecture 13: Superconductivity

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From playlist Mathematics

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From playlist Novel Phases of Quantum Matter 2019

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physics demonstrations Candle oscillator (science experiments)

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From playlist MECHANICS

Related pages

Confounding | Ecological validity | Longitudinal study | External validity | Experiment | Difference in differences | Randomized controlled trial | Internal validity | Random assignment | Panel analysis | Cohort study | Randomization | Propensity score matching | Regression discontinuity design