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2. Descriptive Statistics (The First Look)
- Frequencies: Creating tables for categorical data.
- Descriptives: Calculating mean, median, mode, standard deviation, variance, range.
- Explore: Using split-file analysis to compare groups.
- Visualization: Building bar charts, histograms, boxplots, and scatterplots.
Regression
To perform regression analysis, follow these steps: Frequencies: Creating tables for categorical data
- Select Analyze > Regression > Linear.
- Select the variables and click OK.
5. Data Visualization
Data visualization helps to communicate and understand the data.
3. The "Cons" & Gaps
- Software Version Mismatches: SPSS updates its interface occasionally. A PDF written for SPSS 20 might have menu locations that differ slightly from SPSS 28, which can confuse a total beginner.
- Lack of "Why": Many PDFs are recipe books ("Click here, then here") but fail to explain the statistical theory behind the test. They teach you how to run a regression, but not necessarily when to choose regression over correlation.
- Troubleshooting: When you get an error message (e.g., "The correlation matrix is not positive definite"), a static PDF cannot help you debug. Video tutorials or forums are better for this.
Module 6 : Analyse de Fiabilité et Réduction de Données
- Coefficient Alpha de Cronbach (fiabilité d’une échelle).
- Analyse Factorielle Exploratoire (AFE).
Chapitre 2 : Nettoyage et Préparation des Données
- Tri des cas.
- Recodage en variables discrètes (Ex: Transformer l’âge en tranches d’âge).
- Calcul de nouvelles variables (Ex: Indice de masse corporelle).
- Tutoriel PDF pratique : Comment détecter les outliers (valeurs aberrantes) avec les boîtes à moustaches.