data can be classified as either categorical or quantitative.Data that can be grouped by specific categories are referred to as
categorical data. Categorical data use either the nominal or ordinal scale of measurement. Data that use numeric values to indicate how much or how many are refered to as quantitative data.Quantitative data are obtained using either in the interval or ratio scale of measurement
A categorical variable is variable with categorical data,and a quantitative variable is variable with quantitative data.The statistical analysis appropriate for a particular variable depends upon whether the variable is categorical or quantitative.If the variable is categorical,the statistical analysis is limited.We can summarize categorical data by counting number of observation in each category. How ever,even when the categorical data are identified by a numerical code,arithmetic operations such as addition,subtraction,multiplication ,and division do not provide meaningful results.Section 2.1 discusses ways for summarizing categorical data.
Arithmetic operations provide meaningful results for quantitative variables.For example,quantitative data may be added and then divided by number of observations to compute the average value.This average id usually meaningful and easily interpreted.In general,more alternatives for statistical analysis are possible when data are quantitative.Section 2 and Chapter 3 provide ways of summarizing quantitative data.
data can be classified as either categorical or quantitative.Data that can be grouped by specific categories are referred to as categorical data. Categorical data use either the nominal or ordinal scale of measurement. Data that use numeric values to indicate how much or how many are refered to as quantitative data.Quantitative data are obtained using either in the interval or ratio scale of measurementA categorical variable is variable with categorical data,and a quantitative variable is variable with quantitative data.The statistical analysis appropriate for a particular variable depends upon whether the variable is categorical or quantitative.If the variable is categorical,the statistical analysis is limited.We can summarize categorical data by counting number of observation in each category. How ever,even when the categorical data are identified by a numerical code,arithmetic operations such as addition,subtraction,multiplication ,and division do not provide meaningful results.Section 2.1 discusses ways for summarizing categorical data.Arithmetic operations provide meaningful results for quantitative variables.For example,quantitative data may be added and then divided by number of observations to compute the average value.This average id usually meaningful and easily interpreted.In general,more alternatives for statistical analysis are possible when data are quantitative.Section 2 and Chapter 3 provide ways of summarizing quantitative data.
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