Fix SAS data input alignment - remove list statement and leading whitespace

SAS Examples/README.md

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+# SAS Examples
+
+This directory contains SAS programming examples and solutions to common issues.
+
+## Data Input Alignment Fix (menages_corrected.sas)
+
+### Problem
+In the original code, the data values were not properly aligned, causing "karim" to start in the second column (Sexe) instead of the first column (Nom).
+
+### Original Problematic Code
+```sas
+Data menages_init;
+    length Nom $ 10;
+    input Nom $  Sexe $  Revenu Epargne Anciennete Statut_familial $;
+    list;
+    Cards;
+        karim H 38.5 5.9 10 marie
+        fatima F 31.2 3.8 6 celib 
+        ...
+;
+Run;
+```
+
+### Issues Identified
+1. **The `list;` statement**: This was incorrectly placed and not terminated properly
+2. **Indentation before data**: The data lines had leading spaces/tabs, which can cause misalignment
+3. **`Cards;` vs `Datalines;`**: While both work, `Datalines;` is the modern SAS syntax
+
+### Solution
+The corrected code removes the `list;` statement, uses `Datalines;`, and ensures all data starts at the beginning of each line without leading spaces:
+
+```sas
+Data menages_init;
+    length Nom $ 10;
+    input Nom $ Sexe $ Revenu Epargne Anciennete Statut_familial $;
+    Datalines;
+karim H 38.5 5.9 10 marie
+fatima F 31.2 3.8 6 celib 
+...
+;
+Run;
+```
+
+### Key Points for List Input in SAS
+- **List input** (default when using `$` and no column specifications) reads space-delimited values
+- Data should start at the beginning of lines to avoid parsing issues
+- Each value is read in order based on the INPUT statement
+- Character variables need the `$` modifier
+- No leading spaces should precede the first value on each data line
+
+### Expected Output
+The dataset `menages_init` will be created with 20 observations and the following variables:
+- **Nom**: Name (character, length 10)
+- **Sexe**: Gender (character)
+- **Revenu**: Revenue (numeric)
+- **Epargne**: Savings (numeric)
+- **Anciennete**: Seniority (numeric)
+- **Statut_familial**: Marital status (character)
+
+All values will be correctly aligned in their respective columns.

SAS Examples/menages_corrected.sas

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+/* Corrected SAS Code - Fixed Data Input Alignment Issue */
+/* 
+   Problem: The data was not properly aligned, causing values to shift into wrong columns.
+   Solution: Properly format the data with consistent spacing and ensure each value 
+             is in its correct position for list input.
+*/
+
+Data menages_init;
+    length Nom $ 10;
+    input Nom $ Sexe $ Revenu Epargne Anciennete Statut_familial $;
+    Datalines;
+karim H 38.5 5.9 10 marie
+fatima F 31.2 3.8 6 celib 
+nassim H 27.8 2.0 4 celib 
+amina2 F 35.6 5.2 8 marie 
+tarek H 29.9 1.5 3 celib 
+leila F 41.3 6.7 12 marie 
+samir H 50.1 10.0 18 divorce 
+nora F 24.5 2.2 2 celib 
+mounir H 33.9 4.1 7 celib 
+luc H 42.5 5.2 12 marie 
+amina F 28.3 3.1 5 celib 
+paul H 56.7 12.4 20 marie 
+sarah F 37.9 7.0 10 divorce 
+jean H 22.4 1.2 2 celib 
+claire F 49.8 15.3 25 marie 
+youssef H 33.1 4.8 8 celib 
+marion F 25.6 2.5 3 celib 
+mohamed H 61.2 18.1 30 marie 
+lea F 20.3 0.7 1 celib 
+julien H 45.0 6.5 15 divorce
+;
+Run;
+
+/* 
+   KEY CHANGES MADE:
+   1. Removed the "list;" statement that was causing issues
+   2. Changed "Cards;" to "Datalines;" (more modern SAS syntax)
+   3. Ensured data starts from the beginning of each line (no leading spaces before names)
+   4. All values are properly space-delimited for list input mode
+
+   With list input (default when using $), SAS reads values separated by spaces.
+   The data should start at the beginning of the line to ensure proper alignment.
+*/