Stats/Distribution
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Chi-squared DistributionStats/Distribution 2020. 1. 31. 15:21
1. Overview the chi-square distribution (also chi-squared or χ2-distribution) with k degrees of freedom is the distribution of a sum of the squares of k independent standard normal random variables. The chi-square distribution is a special case of the gamma distribution and is one of the most widely used probability distributions in inferential statistics, notably in hypothesis testing and in co..
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Student's T distributionStats/Distribution 2020. 1. 16. 11:31
1. Overview Visually the Student's t distribution looks much like a normal distribution but generally has fatter tails. fatter tails allow for a higher dispersion of variables and there is more uncertainty. It is a small sample size approximation of a normal distribution. We use the Student's t distribution When it doesn't have sufficient data. Student's t distribution is frequently used when co..