descpage (1).pdf - Lab 1 Lab 1 Descriptive Statistics and...

This preview shows page 1 - 2 out of 10 pages.

Lab 1[12/14/2009 7:45:34 PM]Lab 1 -- Descriptive Statistics and PASW BasicsJohn D. Morris - Florida Atlantic UniversityPASW BasicsThe Example Data SetVariable NamesVariable LabelsVariable ValuesMissing DataOutputInterpretationPASW BasicsThis first PASW lab will demonstrate how PASW works through an exemplar in which we create a simple frequencydistribution, measures of central tendency, and variability.In general, statistical analysis revolves around a certain number of cases (subjects) and variables on which we have"scores" for those subjects. The convention is that these data are represented in a matrix with cases as rows andvariables as columns. The "PASW Data Editor" is used to encode information about the variables that you intend touse, and the actual number values for those variables. Upon opening the Data Editor, notice that it has two "views" asdenoted by the two tabs at the bottom left of the window. One is the "Data View" and one is the "Variable View." You may switch between these views at will by clicking the desired tab. The Variable View is used to provideinformation about the variables. The Data View is used to enter the actual number values for the variables.The Example Data SetSo, let's create an example data set. Let's say that we have gender, race, and GRE scores (Verbal and Quantitative) fora group of subjects. Click the Variable View and then enter the name of the first variable (order doesn't matter). Though it is arbitrary, perhaps the first variable we enter will be gender; so under "Name" we enter "gender." We cando the same for "race" and and the GRE scores, which we will name "grev" and "greq." Variable Names should beno longer than 8 characters, so often we must abbreviate. You should also use only letters and numbers with nospecial characters in variable names. If you do nothing other than this, then PASW will assume default values forsome of the characteristics of the variables. However, we can also modify several attributes of the variables if wewish. For instance, under "Label" we can enter a longer descriptor of what the variable is than is available in the 8character Name, such as "Graduate Record Exam - Verbal," or "Graduate Record Exam - Quantitative." Theseextended labels will be used in the PASW output allowing a more detailed description than simply the maximum of 8character names. Note, however that these Variable Labels are not necessary for an analysis to take place -- only the

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture