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Research has shown that marital status and employment are correlates of desistance. That is, adolescents involved with crime were more likely to discontinue offending in adulthood if they were married and had a good job. Most of what criminologists know about the process of desistance from crime is based on a sample of adult males in the 1950's. There is no question that life in America has changed drastically in the past fifty years. Given the importance of examining historical change inherent in the life course perspective, it is important to determine how changes in the social structure over time impact individuals. Therefore, the goals of this data analysis exercise are to examine changes in marriage and employment over the last fifty years. The purposes are to identify the changes that have taken place, and to hypothesize how these changes may affect the process of desistance from crime today.

HotBits is a genuine random number generator powered by radioactive decay. Simply click the "Request HotBits" link, and specify how many bytes you would like (up to 2048) and in what form you prefer them. Hexadecimal returns numbers and letters, while C language returns integers. Then click the "Get HotBits" button, and your random numbers will appear on the screen.

This online textbook covers the following probability and statistics topics: Independence; Venn Diagrams; Bayes's Theorem; Counting; Binomial Expansion; Binomial Distribution; Continuous Distributions; Infinitesimals in Probability; Averaging; Variance; Gaussian Distribution; Random Walks; Correlation; Causation; Linear Regression; Unbiased Estimators; Hypothesis Testing; Shape of the Distribution; Variance of Mean Differences.

This page explains simple linear regression with an example on muscle strength versus lean body mass.

This lesson introduces simple linear regression with several Excel spreadsheet examples such as temperature versus cricket chirps, height versus shoe size, and laziness versus amount of TV watched. These activities require class participation.

This dataset comes from a study of 26 healthy male subjects randomly assigned to a two-period crossover design. Patients were given either Drug A or Drug B, and data on plasma levels were collected. Questions from this study refer the similarity of the drugs. A text file version of the data is found in the relation link.

This dataset comes from a study of 48 hypertensive patients given one of 3 doses of one drug and one dose of another drug. Questions from this study refer to associations and relationships between the drugs. A text file version of the data is found in the relation link.

This dataset comes from a study of 16 healthy subjects randomly assigned to one of two treatment sequences in a two period crossover design. Treatments were from two different drug companies. Questions from this study refer to the similarities of the two treatments. A text file version of the data is found in the relation link.

This dataset comes from a study of 100 female mice treated with one of 3 doses of a drug, and then impregnated by untreated males. The fetuses were examined for skeletal malformations. Questions from this study refer to the relationship between affected fetuses and dosage. A text file version of the data is found in the relation link.

This dataset comes from a study of 100 mice assigned randomly to one of five treatment groups of graded dosages of a drug. They were also given an injection of another drug, and sleeping times were recorded for each mouse. Questions from this study refer to the relationship between sleeping times and dosage. A text file version of the data is found in the relation link.