Method: Diagnostics

Methods: Diagnostics, Dummy Variable, Interaction, Regression,
Topics: Economics, Government, Consumer,
Datafile Name: Home Prices
Abstract:

From data maintained by the multiple listing agency in Albuquerque, the file contains prices of home resales along with descriptive data on the home, including square feet, age, number of certain features, custom built or not, and corner location or not. Another dummy variable is whether the home...

Methods: Diagnostics, Multicollinearity, Regression,
Topics: Food, Science,
Datafile Name: Cheese
Abstract:

As cheddar cheese matures, a variety of chemical processes take place. The taste of matured cheese is related to the concentration of several chemicals in the final product. In a study of cheddar cheese from the LaTrobe Valley of Victoria, Australia, samples of cheese were analyzed for their chem...

Methods: Assumptions, Regression, Diagnostics, Simple Linear Regression, Scatterplot,
Topics: Science,
Datafile Name: Chromatography
Abstract:

Results of a study of gas chromatography, a technique which is used to detect very small amounts of a substance. Five measurements were taken for each of four specimens containing different amounts of the substance. The amount of the substance in each specimen was determined before the experiment...

Methods: Correlation, Diagnostics, Paired T-Test, Regression, Transformation,
Topics: Consumer, Economics,
Datafile Name: Fish Prices
Abstract:

The price of fish varies by species and time. The average price recieved by fishermen and vessel owners for several species of fish increased from 41 cents per pound in 1970 to $1.10 per pound in 1980. A paired t-test shows that this increase is highly significant.

There is a strong cor...

Methods: Regression, Origin, Regression Thru, Diagnostics,
Topics: Astronomy,
Datafile Name: Hubble
Abstract:

In 1929, Edwin Hubble investigated the relationship between distance of a galaxy from the earth and the velocity with which it appears to be receding. Galaxies appear to be moving away from us no matter which direction we look. This is thought to be the result of the "Big Bang". Hubble ...

Methods: Assumptions, Regression, Outlier, T-test, Boxplot, Diagnostics, Multivariate Regression,
Topics: Economics,
Datafile Name: OECD Economic Development
Abstract:

Data on per capita income and the percentages of the labor force employed in agriculture, industry, and service occupations for 20 Eurpoean OECD countries lend themselves to several kinds of analysis. Univariate analysis of each of the variables is interesting, and the relations between per capit...

Methods: Diagnostics, Regression, Outlier, Transformation,
Topics: Economics, Government, Consumer,
Datafile Name: Home Prices
Abstract:

How taxes change in response to changing market value of homes is a question of concern to citizens as a policy matter as well as a personal financial concern. The tax data included in the datafile Home Prices permit an examination of this question for used homes in Albuquerque in 1993. The linea...

Methods: Dummy Variable, Diagnostics, Interaction, Outlier, Residuals, Transformation,
Topics: Economics, Education, Government,
Datafile Name: Teacher Pay by States
Abstract:

The scatter diagram below shows one potential influential observation, namely Alaska, which is an outlier in terms of spending per pupil. In addition, the question can be raised whether the level and slope of an appropriate regression line would be the same for the three regions of the country. S...

Methods: Assumptions, Regression, Outlier, T-test, Boxplot, Diagnostics, Multivariate Regression,
Topics: Economics,
Datafile Name: OECD Economic Development
Abstract:

The Datafile OECD Economic Develpment  contains per capita income (PCINC)
and the percentage of the labor force employed in agriculture (AGR) for 20 European
OECD countries in 1960. Below are the same variables for the United States by 
decades with PCINC adjusted t...

Methods: Diagnostics, Correlation, Regression,
Topics: Psychology,
Datafile Name: Crawling
Abstract:

This study investigated whether babies take longer to learn to crawl in cold months when they are often bundled in clothes that restrict their movement, than in warmer months. The study sought an association between babies' first crawling age and the average temperature during the month they ...

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