Statistics Samples and Examples

Information and Disclaimer

This directory is available to users who need information about particular statistical procedures. Not all procedures are available here. Information is being added to this directory as appropriate.

The information in this directory is intended to give users an overview of each procedure, and some sample programs that can be used to derive the statistic(s) involved. It is offered with no guarantees as to its completeness or accuracy (though every attempt is made to make it accurate). Responsibility for the choice, derivation and interpretation of statistics lies with the users themselves, and their faculty advisors and colleagues.

The entries in this directory are prepared and maintained by the ITS Senior Statistics consultant, with input from other ITS full- time staff, faculty, and published sources. Personal and published sources are credited whenever possible.

Suggestions and comments are always welcome. This Web space is maintained by Mushtaq Khan, Customer Services Consultant for ITS. Please address comments, questions and suggestions to <mkhan@usc.edu> (213/740-5555).

Analysis of Variance


Analysis of Variance (General)


Analysis of Variance with Unequal Groups


ANOVA with Heterogeneous Variances


Analysis of Variance (Repeated Measures) with No

Grouping Variable (no between-subjects factors)

Contrasts -- Comparing Selected Groups in ANOVA


Coding and Using Dummy Variables


Repeated Measures Analysis -- Data Setup


Paired T-Test


Correlation


Correlation: Pearson Product-Moment Coefficient


Correlation: Point-Biserial


Correlation: Rank (Spearman)


Reliability analysis (including Cronbach's Alpha)


TOBIT Analysis using SAS


LOGIT Analysis using SAS


Comparing two regression lines statistically


Confidence Intervals for Percentages (portions of samples)


Calculations Using only Summary Data (Mean, Standard

Deviation, N, etc.)


Missing Values -- Replacing, Imputing, etc.