diff --git a/scripts/analytics/mongodb/queries/helpVideoStylesABTest.js b/scripts/analytics/mongodb/queries/helpVideoStylesABTest.js
new file mode 100644
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+++ b/scripts/analytics/mongodb/queries/helpVideoStylesABTest.js
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+// Evaluate help videos styles A/B test
+
+// Usage:
+// mongo <address>:<port>/<database> <script file> -u <username> -p <password>
+
+// What do we want to know?
+// For a given style:
+// - Video completion rates (Not too interesting unless each level has all styles available)
+// - Video completion rates, per-level too
+// TODO: The rest of these.
+// - Watched another video
+// - Level completion rates
+// - Subscription coversion rates
+// - How many people who start a level click the help button, and which one?
+//    - Need a hard start date when the help button presented
+
+
+// Intial production deploy completed at 12:42am 12/18/14 PST
+var testStartDate='2014-12-14T08:42:00.000Z';
+
+function printVideoCompletionRates() {
+  print("Querying for help video events...");
+  var videosCursor = db['analytics.log.events'].find({
+    $and: [
+    {"created": { $gte: ISODate(testStartDate)}},
+    {$or : [
+      {"event": "Start help video"},
+      {"event": "Finish help video"}
+      ]}
+      ]
+    });
+
+
+  print("Building video progression data...");
+  // Build: <style><level><userID><event> counts
+  var videoProgression = {};
+  while (videosCursor.hasNext()) {
+    var doc = videosCursor.next();
+    var userID = doc.user.valueOf();
+    var levelID = doc.properties.level;
+    var style = doc.properties.style;
+    var event = doc.event;
+    if (!videoProgression[style]) videoProgression[style] = {};
+    if (!videoProgression[style][levelID]) videoProgression[style][levelID] = {};
+    if (!videoProgression[style][levelID][userID]) videoProgression[style][levelID][userID] = {};
+    if (!videoProgression[style][levelID][userID][event]) videoProgression[style][levelID][userID][event] = 0;
+    videoProgression[style][levelID][userID][event]++;
+  }
+
+  // Overall per-style
+
+  print("Counting start/finish events per-style...");
+  // Calculate overall video style completion rates, agnostic of level
+  // Build: <style><event>{<starts>, <finishes>}
+  var styleCompletionCounts = {}
+  for (style in videoProgression) {
+    styleCompletionCounts[style] = {};
+    for (levelID in videoProgression[style]) {
+      for (userID in videoProgression[style][levelID]) {
+        for (event in videoProgression[style][levelID][userID]) {
+          if (!styleCompletionCounts[style][event]) styleCompletionCounts[style][event] = 0;
+          styleCompletionCounts[style][event] += videoProgression[style][levelID][userID][event];
+        }
+      }
+    }
+  }
+
+  print("Sorting per-style completion rates...");
+  var styleCompletionRates = [];
+  for (style in styleCompletionCounts) {
+    var started = 0;
+    var finished = 0;
+    for (event in styleCompletionCounts[style]) {
+      if (event === "Start help video") started += styleCompletionCounts[style][event];
+      else if (event === "Finish help video") finished += styleCompletionCounts[style][event];
+      else throw new Error("Unknown event " + event);
+    }
+    var data = {
+      style: style,
+      started: started,
+      finished: finished
+    };
+    if (finished > 0) data['rate'] = finished / started * 100;
+    styleCompletionRates.push(data);
+  }
+  styleCompletionRates.sort(function(a,b) {return b['rate'] && a['rate'] ? b.rate - a.rate : 0;});
+
+  print("Overall per-style completion rates:");
+  for (var i = 0; i < styleCompletionRates.length; i++) {
+    var item = styleCompletionRates[i];
+    var msg = item.style + (item.style === 'edited' ? "\t\t" : "\t") + item.started + "\t" + item.finished;
+    if (item['rate']) msg += "\t" + item.rate + "%";
+    print(msg);
+  }
+
+  // Style completion rates per-level
+
+  print("Counting start/finish events per-level and style...");
+  var styleLevelCompletionCounts = {}
+  for (style in videoProgression) {
+    for (levelID in videoProgression[style]) {
+      if (!styleLevelCompletionCounts[levelID]) styleLevelCompletionCounts[levelID] = {};
+      if (!styleLevelCompletionCounts[levelID][style]) styleLevelCompletionCounts[levelID][style] = {};
+      for (userID in videoProgression[style][levelID]) {
+        for (event in videoProgression[style][levelID][userID]) {
+          if (!styleLevelCompletionCounts[levelID][style][event]) styleLevelCompletionCounts[levelID][style][event] = 0;
+          styleLevelCompletionCounts[levelID][style][event] += videoProgression[style][levelID][userID][event];
+        }
+      }
+    }
+  }
+
+  print("Sorting per-level completion rates...");
+  var styleLevelCompletionRates = [];
+  for (levelID in styleLevelCompletionCounts) {
+    for (style in styleLevelCompletionCounts[levelID]) {
+      var started = 0;
+      var finished = 0;
+      for (event in styleLevelCompletionCounts[levelID][style]) {
+        if (event === "Start help video") started += styleLevelCompletionCounts[levelID][style][event];
+        else if (event === "Finish help video") finished += styleLevelCompletionCounts[levelID][style][event];
+        else throw new Error("Unknown event " + event);
+      }
+      var data = {
+        level: levelID,
+        style: style,
+        started: started,
+        finished: finished
+      };
+      if (finished > 0) data['rate'] = finished / started * 100;
+      styleLevelCompletionRates.push(data);
+    }
+  }
+  styleLevelCompletionRates.sort(function(a,b) {return b['rate'] && a['rate'] ? b.rate - a.rate : 0;});
+  
+  print("Per-level style completion rates:");
+  for (var i = 0; i < styleLevelCompletionRates.length; i++) {
+    var item = styleLevelCompletionRates[i];
+    var msg = item.level + "\t" + item.style + "\t" + item.started + "\t" + item.finished;
+    if (item['rate']) msg += "\t" + item.rate + "%";
+    print(msg);
+  }
+}
+printVideoCompletionRates();
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