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In the previous note of descriptive statistics, we have introduced bivariate scatter plots and learned the technique to analyze the relationship between two variables. Moreover, this note will learn about other graphical tools called Quantile-Quantile (Q-Q) plot to find the association between two variables differently. Need for Quantile-Quantile (Q-Q) plots Suppose we received two samples from some …

Descriptive Statistics – Measures of association – Quantile-Quantile Plots Read More »

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In the previous note on assiciation of variables, we have introduced the need to study the association of variables using different tools. Moreover, this note will start with graphical tools to measure the degree of association between variables. A very useful graph for visualizing the relationship between two quantitative variables is a scatterplot. It provides …

Descriptive Statistics – Measures of association – Bivariate scatter plots Read More »

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In the earlier notes on descriptive statistics, we covered descriptive statistics for univariate analysis using both graphical and analytical tools. In the graphical tools for the univariate analysis, we have seen different plotting techniques such as histogram, scatter plot, and kernel density functions to visualize the characteristics of individual data points within a variable. Compared …

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In the earlier notes of descriptive statistics, we have covered raw, central, and absolute moments. In this note, we will study the characteristics, precisely the shape and peakedness, of the frequency curve or distribution in terms of the followings: Skewness: It tells the amount and the direction of skewness from the horizontal symmetry. Kurtosis: It tells the shape of the …

Descriptive Statistics – Measures of Shape – Skewness, and Kurtosis Read More »

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In the earlier notes of descriptive statistics, we have seen raw and central moments and how raw and central moments are related to each other. In this note, we will cover absolute moments. Absolute Moments Data are usually categorized into two categories, discrete and continuous, and both these types of data are handled differently. In …

Descriptive Statistics – Absolute Moments Read More »

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In the earlier note of descriptive statistics, we have introduced the moment and its significance. In this note, we will understand moments about arbitrary points and then specific to statistic of data. Moments about Arbitrary Point A Data are usually categorized into two categories, discrete and continuous, and both these types of data are handled …

Descriptive Statistics – Raw and Central Moments Read More »

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