+/**
+ * The data structure representing the sorting hat data
+ *
+ * @typedef tSortingHatData
+ * @type object
+ * @param {number} state the current state: 0 for waiting, 1 for
+ * polling, 2 for cool down.
+ * @param {string} [winner] the winner after polling, might be null if
+ * no winner is detected
+ * @param {Object.<string,tRunningAverages>} runningAverages the running averages for
+ * the different categories, used to render the waves
+ */
+
+/**
+ * The running averages, including the current sum and count
+ *
+ * @typedef tRunningAverages
+ * @type object
+ * @param {number} sum the current total
+ * @param {number} count the number of samples
+ * @param {number} average the average (sum / count)
+ */
+
+/**
+ * The main data service, connects to a socket and updates the internal
+ * data structure
+ *
+ * @class DataService
+ */