Variable Types--An overview of the different types of variables from the State University of New York.
Measurement Scales in Social Science Research--Explanation of nominal and ordinal scales as well as measurement issues in general. From the Department of Psychology, Douglas College, British Columbia, Canada.
Understanding Descriptive Statistics--Sarang Narkhede of Towards Data Scienceprovides a comprehensive understanding of descriptive statistics, measures of central tendency, measures of dispersion, skewness, kurtosis, and correlation.
