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Normal Distribution01:11

Normal Distribution

17.2K
The normal, a continuous distribution, is the most important of all the distributions. Its graph is a bell-shaped symmetrical curve, which is observed in almost all disciplines. Some of these include psychology, business, economics, the sciences, nursing, and, of course, mathematics. Some instructors may use the normal distribution to help determine students’ grades. Most IQ scores are normally distributed. Often real-estate prices fit a normal distribution. The normal distribution is...
17.2K
Normal Stress01:19

Normal Stress

1.4K
Normal stress is a type of stress that occurs when forces act perpendicular, or normal, to a material's cross-sectional area. This stress often arises in structures when subjected to axial loading, which is the application of force along the axis of an object. A practical example of this can be found in bridge truss members.
When a rod is under axial loading, the internal forces and corresponding stress are normal to the plane of the section, so it is termed normal stress. It's important to...
1.4K
Variation: Normal Distribution, Range, and Standard Deviation02:32

Variation: Normal Distribution, Range, and Standard Deviation

28.2K
In the field of psychology, there are several ways to organize measurements of a trait, feature, or characteristic (i.e., variables). Qualitative data, such as ethnicity, can be tabulated into a frequency count to provide information about the proportion, as well as the variety of groups in a sample or population. On the other hand, researchers can perform a wider set of calculations on quantitative data. The mean, mode, and median, for instance, are central tendency measures to identify a...
28.2K
Applications of Normal Distribution01:22

Applications of Normal Distribution

9.5K
The normal distribution is a useful statistical tool. One of its practical applications is determining the door height after considering the normal distribution of heights of persons, such that many can pass through it easily without striking their heads. The normal distribution can also determine the probability of a person having a height less than a specific height.
The heights of 15 to 18-year-old males from Chile from 1984 to 1985 followed a normal distribution. The mean height is 172.36...
9.5K
Introduction to Normal Distributions01:29

Introduction to Normal Distributions

73
Standardized test scores often follow a symmetric distribution that can be modeled with the normal distribution, a fundamental concept in statistics. This distribution is particularly useful for interpreting test performance fairly across populations, as it provides a mathematical framework for understanding variability and central tendency in large datasets.From Histogram to Frequency DistributionRaw test data are often displayed using histograms, where the height of each bar represents the...
73
Normal and Shear Force01:14

Normal and Shear Force

3.3K
When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
3.3K

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Related Experiment Video

Updated: Feb 4, 2026

Exploring the Root Microbiome: Extracting Bacterial Community Data from the Soil, Rhizosphere, and Root Endosphere
09:55

Exploring the Root Microbiome: Extracting Bacterial Community Data from the Soil, Rhizosphere, and Root Endosphere

Published on: May 2, 2018

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Normalization of Microbiome Profiling Data.

Paul J McMurdie1

  • 1Whole Biome, Inc., San Francisco, CA, USA. mcmurdie@stanford.edu.

Methods in Molecular Biology (Clifton, N.J.)
|October 10, 2018
PubMed
Summary

Normalization is crucial but poorly understood in metagenomics. This chapter clarifies definitions and demonstrates reproducible normalization procedures for taxonomic profiling data, aiding accurate analysis.

Area of Science:

  • Microbiology
  • Bioinformatics
  • Computational Biology

Background:

  • Normalization is frequently used but lacks clear definition and understanding in scientific research.
  • A wide array of normalization procedures exist, with varying appropriateness and relevance depending on the specific data and analytical goals.
  • Metagenomic data analysis, particularly taxonomic profiling, requires careful consideration of normalization techniques.

Purpose of the Study:

  • To define and clarify normalization concepts within the field of metagenomics.
  • To provide specific, reproducible examples of normalization procedures tailored for taxonomic profiling.
  • To enhance the understanding and application of appropriate normalization methods in metagenomic data analysis.

Main Methods:

  • Review and definition of key normalization concepts relevant to metagenomics.
Keywords:
DNA sequencingMetagenomicsMicrobiomeNormalizationStatistics

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  • Demonstration of specific normalization procedures using reproducible examples.
  • Provision of analysis and graphics code for reader re-use.

    • Main Results:

    • Key definitions of normalization in the context of metagenomics are presented.
    • Reproducible examples illustrate the application of normalization procedures for taxonomic profiling.
    • The importance of selecting analysis-specific normalization methods is highlighted.

    Conclusions:

    • Clear definitions and demonstrated procedures improve the understanding and application of normalization in metagenomics.
    • Appropriate normalization is critical for accurate taxonomic profiling and downstream analysis.
    • Accessible code facilitates the re-use and validation of normalization techniques by researchers.