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Estimation of Genetic Parameters in Plant Breeding: Theory, Example and Demonstration in AgriAnalyze tool

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The blog is about estimation of genetic parameters like genotypic variance, phenotypic variance, heritability, genetic advance, genetic advance as a percentage of mean, phenotypic coefficient of variation (PCV), genotypic coefficient of variation (GCV) for the RCBD trails of genotypes. (Reading time 20 mins). 1.      INTRODUCTION      In a general statistical context, a parameter refers to a numerical characteristic or attribute that describes a population. It can be a fixed value or an unknown quantity that helps to describe or summarize a specific aspect of a population. Genetic Parameter is a statistical measure that quantifies the genetic contributions to traits within a population of an organism. Genetic parameter estimation in plant breeding involves quantifying various genetic components that influence traits of interest, such as yield, disease resistance or quality attributes. These parameters provide critical insights into the genetic bas...
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F test: Theory, Solved Example and Demonstration in Agri Analyze

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 The blog discuss in details about theory of F test, its use cases, solved example (manually) and a demonstration using online tool Agri Analyze (Reading time 10 min)  Introduction The F-test is a statistical method used to compare the variances of two samples or the ratio of variances across multiple samples. It assesses whether the data follow an F-distribution under the null hypothesis, assuming standard conditions for the error term (ε). The test statistic, denoted as F, is commonly used to compare fitted models to determine which best represents the underlying population. F-tests are frequently employed in models fitted using least squares. The test is named after Ronald Fisher, who introduced the concept as the "variance ratio" in the 1920s, with George W. Snedecor later naming the test in Fisher’s honor. Definition An F-test uses the F-statistic to evaluate whether the variances of two samples (or populations) are equal. The test assumes that the population follows an ...
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