DATA SETS

• Biting Flies (Johnson and Wichern, 1998)
• Tumor growth (Barzi, et al., 1999)
• Anxiety Reduction Treatment (Landenna et al., 1998)
• Job satisfaction (Pallini and Pesarin, 1992)
• Length of worms (Pollard, 1977)

In this data set morphological characteristics of two species of biting flies are collected. The two species are Leptoconops Carteri and Leptoconops Torrens (genus leptoconops). They are so morphologically similar that for many years they have been considered as a unique species.

On 35 units of each species, a multivariate variable composed of 7 dependent taxonomic responses is observed.

Each univariate component is described in the following table:

The data set is organized in multiple records including 8 variables; 7 of which are the taxonomic responses and a further variable indicates the species as follows:

This data set is related to an experiment whose purpose was to investigate the anticancer activity of a new taxol like drug . The animal model used are nude mice with an ovarian tumoral mass with a 4-8 mm diameter.

Experimental units have been randomised in four groups differing for the dose of the drug. A control group (1^st) has been treated with a physiological solution and three groups (2^nd, 3^rd, 4^th) have been treated with an increasing dose of the drug.

In order to avoid the possible toxic effect of the drug, treatments have been administered a total of 3 times, at intervals of 4 days.

Volumes of tumoral masses are measured before the beginning of the treatment (baseline volume) and after the beginning at intervals of 4 days for a total of 18 times.

Each time the mass is observed the response variable is the relative volume of the tumoral mass with respect to the baseline volume.

This data set collects paired data on a training treatment for the reduction of anxiety in a sample of 20 subjects. The latter are presumed to be homogeneous with respect to the most common confounding factors, e.g. sex, age, heath status etc.

Anxiety is measured according to IPAT (Institute for Personality and Ability Testing) in terms of quantitative score. The latter is calculated by the sum of the responses to a set of different items of a standardized psychological test.

Each unit is observed before the training treatment (baseline observation) and one week after a fixed number of training sessions. From these two dependent variables a further dependent variable, indicating the observed individual difference, is calculated.

This data set is referred to a psychological experiment for comparing the perceived degree of job satisfaction in 20 workers. They were classified by the dichotomous attribute "extroverted / introverted" in two groups respectively of 12 and 8 units. The latter are presumed to be homogeneous with respect to the most common confounding factors, e.g. sex, age, heath status, social status, etc.

The response variable consists of the measure of the perceived degree of job satisfaction in terms of a quantitative score calculated by the sum of sub-responses, each related to a particular sub-aspect.

The data set is organized in multiple records including 2 variables: the response variable and a further variable indicating the group:

This data set refers to a one-way ANOVA testing problem for the equality in distribution of the length of worms in 3 distinct groups.

The data set is organized in multiple records including 2 variables: the response variable and a further variable indicating the group: