diff --git a/analysis/analyse.js b/analysis/analyse.js
old mode 100644
new mode 100755
index e1e153c..a73e684
--- a/analysis/analyse.js
+++ b/analysis/analyse.js
@@ -1,3 +1,4 @@
+#!/usr/bin/node
 var lib = require('./lib.js');
 
 function main(path) {
@@ -5,106 +6,25 @@ function main(path) {
     var db = lib.loadFromFile(path);
     var groups = lib.makeGroups(db);
 
+    // Erase groups that are not usable
+    groups = groups.filter(function(elt) {
+
+        // An elt is valid if it contains at least 2 exp, BaseRecommendation included
+        return elt.length > 1 && elt.find(function(e) { return e.recommendation_style[4] === 'B'; }) !== undefined;
+
+    });
+
+    groups.forEach(function(elt) {
+        elt.sort(lib.compareRecommendationStyle);
+    });
+
     console.log(`There were ${db.users.length} users for ${db.experiments.length} experiments`);
-
-    var meanTimeNoReco = 0;
-    var meanTimeArrow = 0;
-    var meanTimeViewport = 0;
-
+    console.log(`There were ${groups.length} groups that were made.`);
 
     groups.forEach(function(elt) {
-        var ok = true;
-
-        // console.log(elt);
-        elt.sort(compareRecommendationStyle);
-        // console.log(elt);
-
-        elt.forEach(function(subElt) {
-            if (subElt.coin_combination_id !== elt[0].coin_combination_id) {
-                ok = false;
-            }
-        });
-
-        if (!ok) {
-            process.stderr.write('Error : assertion failed');
-            process.exit(-1);
-        }
-
-        console.log(elt.length + ' -> ' + elt[0].coin_combination_id);
+        console.log(elt.length);
     });
 
-    console.log('-----------------');
-
-    var value = minDifferences(groups);
-    console.log(value);
-
-}
-
-function minDifference(exps) {
-
-    var dict = {};
-
-    exps.forEach(function(subElt) {
-        dict[subElt.recommendation_style[4]] = subElt.duration;
-    });
-
-    if (dict.B !== undefined) {
-
-        if (dict.A !== undefined && dict.V !== undefined) {
-            return (
-                Math.min(dict.A - dict.B, dict.V - dict.B)
-            );
-        }
-
-        if (dict.A !== undefined) {
-            return dict.A - dict.B;
-        }
-
-        if (dict.V !== undefined) {
-            return dict.V - dict.B;
-        }
-    }
-
-}
-
-function minDifferences(groups) {
-
-    var differences = [];
-
-    groups.forEach(function(elt) {
-
-        var timesMean = 0;
-
-        elt.forEach(function(elt) {
-            var duration = experimentDuration(elt);
-            timesMean += experimentDuration(elt);
-        });
-
-        timesMean /= elt.length;
-
-        var normalizedElt = [];
-
-        elt.forEach(function(subElt) {
-            normalizedElt.push({
-                recommendation_style : subElt.recommendation_style,
-                duration : experimentDuration(subElt) / timesMean
-            });
-        });
-
-        var diff = minDifference(normalizedElt);
-
-        if (diff !== undefined)
-            differences.push(diff);
-    });
-
-    var sum = 0;
-
-    differences.forEach(function(elt) {
-        sum += elt;
-    });
-
-    return sum / differences.length;
-
 }
 
 if (process.argv.length !== 3) {
diff --git a/analysis/generateData.js b/analysis/generateData.js
old mode 100644
new mode 100755
index 9cb354f..8b8065d
--- a/analysis/generateData.js
+++ b/analysis/generateData.js
@@ -1,3 +1,4 @@
+#!/usr/bin/node
 var pgc = require('../private.js');
 
 var url = pgc.url;
diff --git a/analysis/numberOfInteractionCurve.js b/analysis/numberOfInteractionCurve.js
old mode 100644
new mode 100755
index ecc2129..096815b
--- a/analysis/numberOfInteractionCurve.js
+++ b/analysis/numberOfInteractionCurve.js
@@ -1,3 +1,4 @@
+#!/usr/bin/node
 // Shows with and without : time to last coin = f(CoinCombination)
 
 var lib = require('./lib.js');
diff --git a/analysis/timeBetweenTwoCoins.js b/analysis/timeBetweenTwoCoins.js
old mode 100644
new mode 100755
index 8cb064d..de6a177
--- a/analysis/timeBetweenTwoCoins.js
+++ b/analysis/timeBetweenTwoCoins.js
@@ -1,3 +1,4 @@
+#!/usr/bin/node
 // Shows with and without : time to last coin = f(CoinCombination)
 
 var lib = require('./lib.js');
diff --git a/analysis/timeCurve.js b/analysis/timeCurve.js
old mode 100644
new mode 100755
index 5ef627c..cfe1b0f
--- a/analysis/timeCurve.js
+++ b/analysis/timeCurve.js
@@ -1,3 +1,4 @@
+#!/usr/bin/node
 // Shows with and without : time to last coin = f(CoinCombination)
 
 var lib = require('./lib.js');