Cheatography

# Statistics Cheat Sheet (DRAFT) by Hibawot

This is a draft cheat sheet. It is a work in progress and is not finished yet.

### Scientific Approach

 Systematic Empiricism Public Verifi­cation Solvable Problems

### Strategies in Behavioral Research

 Descri­ptive Correl­ational Experi­mental: Cause & Effect + Manipu­lation + Random Assignment + Control Quasi-­Exp­eri­mental: Less Control and/or No Random Assignment

### Empirical Cycle

 Observ­ation: research question Induction: observable facts --> general theory * Deduction: general theory --> hypothesis (or research question) ** Testing: Collecting > Analyzing > Conclu­sions Evalua­tion: Confir­mation or Falsif­ica­tion? Adjust­/Ex­pan­d/I­mprove? Critical Review
* Theory: Set of propos­itions that attempts to explain relati­onships among a set of concepts
** Hypoth­esis: Prediction following from theory (logic) -- could be conceptual (abstract) or operat­ional (concrete)

### Proof or Disproof

 Proof: Logically Impossible Disproof: Practi­cally Impossible
* Method­olo­gical Pluralism is the variab­ility of methods

### Total = Systematic + Error

 Total All differ­ences between observ­ations Systematic Differ­ences between groups Error Unexpl­ained differ­ences

### Variance Accounted For (VAF)

 is the proportion of the total variance that is systematic variance VAF = Systematic Variance / Total Variance VAF = 0 = no relation = no systematic variance VAF = 1 = perfect relation = no error variance

### Cohen's Rule of Thumb (VAF)

 Small 0.01 Medium 0.06 Large 0.15<