Statistical ratios | Statistical tests | Summary statistics

Lexis ratio

The Lexis ratio is used in statistics as a measure which seeks to evaluate differences between the statistical properties of random mechanisms where the outcome is two-valued — for example "success" or "failure", "win" or "lose". The idea is that the probability of success might vary between different sets of trials in different situations. This ratio is not much used currently having been largely replaced by the use of the chi-squared test in testing for the homogeneity of samples. This measure compares the between-set variance of the sample proportions (evaluated for each set) with what the variance should be if there were no difference between in the true proportions of success across the different sets. Thus the measure is used to evaluate how data compares to a fixed-probability-of-success Bernoulli distribution. The term "Lexis ratio" is sometimes referred to as L or Q, where Where is the (weighted) sample variance derived from the observed proportions of success in sets in "Lexis trials" and is the variance computed from the expected Bernoulli distribution on the basis of the overall average proportion of success. Trials where L falls significantly above or below 1 are known as supernormal and subnormal, respectively. This ratio ( Q ) is a measure that can be used to distinguish between three types of variation in sampling for attributes: Bernoullian, Lexian and Poissonian. The Lexis ratio is sometimes also referred to as L. (Wikipedia).

Video thumbnail

Ratios

This video defines a ratio and provides several examples on how to write a ratio and shows how to simplify a ratio. http://mathispower4u.wordpress.com/

From playlist Ratios and Rates

Video thumbnail

Equivalent ratios

This is a short video tutorial on equivalent ratios. ✤ ✤ ✤ INTERACTIVE APPLETS AND WORKSHEETS ✤ ✤ ✤ http://fearlessmath.net ✤ ✤ ✤ FOLLOW ME ON TWITTER ✤ ✤ ✤ http://twitter.com/dhabecker

From playlist All about ratios and proportions

Video thumbnail

Introduction to Ratios

Basic ratio problems. (from KhanAcademy.org)

From playlist Algebra

Video thumbnail

Identifying and solving proportions

This is a short video tutorial on identifying and solving proportions. For interactive applets, worksheets, and more videos go to http://www.mathvillage.info

From playlist All about ratios and proportions

Video thumbnail

Introduction to Ratios (2 of 2: Equivalent Ratios)

More resources available at www.misterwootube.com

From playlist Basic Ratios & Rates

Video thumbnail

The Golden Ratio

This video introduces the Golden ratio and provides several examples of where the Golden ratio appears. http:mathispower4u.com

From playlist Mathematics General Interest

Video thumbnail

How to study for your math exam.... | Week 44 Open Q&A

👉 In this livestream I will cover some of the tips and advice I give to my own students on studying for their exam. I will go over my special checklist I cover with my students as well that is available to download here: https://www.brianmclogan.com/examchecklist 00:00 intro 17:00 Find t

From playlist Open QandA 2020

Video thumbnail

Case File Pupdate: Lexie Jane | Cesar 911

Find out how Lexie Jane and Holly's hikes are going after their work with Cesar. Has Holly learned how to control her over-protective terrier mix? ➡ Subscribe: http://bit.ly/NatGeoWILDSubscribe About Cesar 911: Cesar Millan is back in his element - rehabilitating dogs and training people

From playlist Cesar Millan | National Geographic

Video thumbnail

GCSE Maths Predicted Paper 3 Wednesday 14th June 2023 | Foundation | Exam Walkthrough | Edexcel AQA

Here is a practice paper that I have selected to help with the 2023 GCSE maths foundation paper 3 exam. I hope you enjoy it! Download the booklet here: https://1drv.ms/b/s!Ag8Cv-UM_XGOg84Uykksxp_H4XjPQA?e=MYYhFn Join this channel to get access to perks: https://www.youtube.com/channel/UC

From playlist 2023 Revision Videos and Practice Papers

Video thumbnail

Comparing with ratios

Which typist is fast? Use ratios to compare the two typists. Move videos at http://www.MathVillage.info

From playlist All about ratios and proportions

Video thumbnail

GCSE Maths Predicted Paper 3 Wednesday 14th June 2023 | Higher | Exam Walkthrough | Edexcel AQA

Here is a practice paper that I have selected to help with the 2023 GCSE maths higher paper 3 exam. I hope you enjoy it! Download the booklet here: https://1drv.ms/b/s!Ag8Cv-UM_XGOg84V_oUCq1vZs7pr0g?e=0Cam0K Join this channel to get access to perks: https://www.youtube.com/channel/UCStPz

From playlist 2023 Revision Videos and Practice Papers

Video thumbnail

Gender Free Kids: Questioning Gender Based Prejudice (Education Documentary) | Real Stories

Is the way we treat boys and girls the real reason we haven't achieved equality between men and women? Dr Javid Abdelmoneim aims to find out by taking over a primary school class. Facebook - https://www.facebook.com/RealStoriesChannel Instagram - @realstoriesdocs Twitter: https://twitter.

From playlist Should Our kids Go Gender-Free? : Season 1

Video thumbnail

Ratio Tables and Proportions

Learn how to take equivalent ratios and rewrite them into a ratio table. Then solve a proportion question with the table. http://www.MathVillage.info

From playlist All about ratios and proportions

Video thumbnail

Ratios Introduction - what are ratios?

Ratios are used to compare different quantities. In this introduction to ratios we will look at what ratios are, how we deal with ratios of different measurement units and that ratios can be simplified. To donate to the tecmath channel:https://paypal.me/tecmath To support tecmath on Pa

From playlist Ratios

Video thumbnail

27c3: Contemporary Profiling of Web Users

Speakers: Dominik Herrmann, lexi On Using Anonymizers and Still Get Fucked This talk will provide a summary of recently discovered methods which allow to break the Internet's privacy and anonymity. We will show, amongst others: * ways of distinguishing bots from humans. We use this

From playlist 27C3: We come in peace

Video thumbnail

Unit ratios (unit rates)

This is a short video tutorial on unit ratios...also called unit rates. For interactive applets, worksheets, and more videos go to http://www.mathvillage.info

From playlist All about ratios and proportions

Video thumbnail

27c3: Contemporary Profiling of Web Users (en)

Speakers: Dominik Herrmann , lexi On Using Anonymizers and Still Get Fucked This talk will provide a summary of recently discovered methods which allow to break the Internet's privacy and anonymity. We will show, amongst others: •ways of distinguishing bots from humans. We use th

From playlist 27C3: We come in peace

Related pages

Overdispersion | Statistics | Sample variance | Bernoulli distribution | Chi-squared test