How to get Rating summary in magento

How to get Rating summary in magento

$product = Mage::getModel('catalog/product')->load($productId);  // Place your product id here...
$storeId = Mage::app()->getStore()->getId();
Mage::getModel('review/review')->getEntitySummary($product, $storeId);
Rating summary = $product->getRatingSummary()->getRatingSummary();