This online electronic textbook 3 Websites To Purchase Electronic College Textbooks 3 Websites To Purchase Electronic College Textbooks One of the biggest shocks for me when I first enrolled in college was the insane cost of textbooks. Unfortunately, there is really no way to cut out this problem, but if you don't want... Read More is provided by StatSoft, the company that makes STATISTICA software, which is now a part of Dell. It’s a full-featured free textbook that’s focused on computational applications of statistics, like data mining and neural networks. It contains a wealth of statistics information that spans from the basics to quite advanced applications.

Analysis of variance is a statistical procedure that uses the F- ratio to test the overall fit of a linear model. In experimental research this linear model tends to be defined in terms of group means and the resulting ANOVA is therefore an overall test of whether group means differ. However, it is a special case of ordinary linear regression in which the outcome variable is continuous and the predictors are categorical. A one-way ANOVA implies a linear model in which a continuous variable is predicted from one categorical variable (of two or more categories). A one-way between-group ANOVA implies that the categorical predictor contains categories that are independent (that is scores in one category are unrelated to those in another). In experimental research this occurs when, for example, different entities are randomized to different experimental groups (a between-group design ).

If the F -test suggests that there are significant group differences (. you can predict the outcome significantly from category membership) it is customary to follow-up the analysis with planned contrasts or post hoc tests .

Planned contrasts are a set of comparisons between group means that are constructed before the data are collected. These are theory-led comparisons and are based on the idea of partitioning the variance created by the overall effect of group differences into gradually smaller portions of variance. These tests have more power than post hoc tests .

Post hoc tests are a set of comparisons between group means that were not thought of before data were collected. Typically these tests involve comparing the means of all combinations of pairs of groups. To compensate for the number of tests conducted, each test uses a strict criterion for significance. As such, they tend to have less power than planned contrasts . They are usually used for exploratory work for which no firm hypotheses were available on which to base planned contrasts.

The chapters are structured in a clear manner, the language is clear and terms are explained throughout so that you won’t have to flip nervously through several books at the same time and do the work a smart author and editing team would have done for you. Formulae and tables produced in SPSS are displayed in a logical manner, for instance the dialog box to be selected in SPSS is followed by a scatterplot which in turn is illustrated by SPSS outputs. The latter are also explained in detail so you know what they actually mean, how to write them up in a conventional way, how to analyse them and how to interpret the outcome. Key terms have been printed in red and the SPSS dialogue boxes also come in colour.

I'll also show you how to enter and read data in SPSS, create data labels, check and clean data, and create new variables and compute transformations. Finally, I'll demonstrate how you can format your charts and tables for presentation, save your stubs and syntax files to recreate and share your analyses, export your results to use in other programs, and share your results with others. If you're ready to get going, let's get started with SPSS Statistics Essential Training.

I'll also show you how to enter and read data in SPSS, create data labels, check and clean data, and create new variables and compute transformations. Finally, I'll demonstrate how you can format your charts and tables for presentation, save your stubs and syntax files to recreate and share your analyses, export your results to use in other programs, and share your results with others. If you're ready to get going, let's get started with SPSS Statistics Essential Training.