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Answer: Just before the closing </body> tag of your website.
Google allows Multiple tracking codes on web pages. However, some configs may not be supported. You can install multiple instances of the Google Analytics tracking code on your web pages to send data to multiple properties in your account. Not all configurations are supported.
Same web property ID is tracked twice simply means that you have the Google Analytics tracking script on your page more than once, with the same tracking ID. This means every page load fires off two or more instances of the GA code, and will cause metrics like page views and bounce rate to be incorrect.
Google used to recommend putting it just before the </body> tag, because the original method they provided for loading ga.js was blocking. The newer async syntax, though, can safely be put in the head with minimal blockage, so the current recommendation is just before the </head> tag.
<head> will add a little latency; in the footer will reduce the number of pageviews recorded at some small margin. It's a tradeoff. ga.js is heavily cached and present on a large percentage of sites across the web, so its often served from the cache, reducing latency to almost nil.
As a matter of personal preference, I like to include it in the <head>, but its really a matter of preference.
As google says:
Paste it into your web page, just before the closing
</head>tag.One of the main advantages of the asynchronous snippet is that you can position it at the top of the HTML document. This increases the likelihood that the tracking beacon will be sent before the user leaves the page. It is customary to place JavaScript code in the
<head>section, and we recommend placing the snippet at the bottom of the<head>section for best performance
If you want your scripts to load after page has been rendered, you can use:
function getScript(a, b) {
var c = document.createElement("script");
c.src = a;
var d = document.getElementsByTagName("head")[0],
done = false;
c.onload = c.onreadystatechange = function() {
if (!done && (!this.readyState || this.readyState == "loaded" || this.readyState == "complete")) {
done = true;
b();
c.onload = c.onreadystatechange = null;
d.removeChild(c)
}
};
d.appendChild(c)
}
//call the function
getScript("http://www.google-analytics.com/ga.js", function() {
// do stuff after the script has loaded
});
Yes, it is recommended to put the GA code in the footer anyway, as the page shouldnt count as a page visit until its read all the markup.
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