Feel free to use these and let us know what you think – we are always looking for ways to make these better.
GAS is a wrapper around the Google Analytics Tracking API. It adds new functionality while keeping the same API. Implement GAS and start getting a lot more data from your Google Analytics reports.
Planning a test and want to know how many impressions of an ad or visitors to your website you'll need? Planning to test an email and want to know how many mails you'll have to send? Use this sample size estimator to find out! You can see an array of different confidence levels and difference levels to help you plan your next test.
Are you doing landing page testing to constantly increase your website's conversion rate? You can use this tool to analyze variations on your landing pages to see which is giving you the best conversion rate with statistical confidence.
Do you use Google AdWords, Yahoo! Search Marketing, MSN adCenter, or any other Pay Per Click (PPC) advertising tools? Then you should be split testing your ads to make sure you're getting the most out of your pay per click budget. Use this tool to see if the differences in click through rate (CTR) and conversion rate are statistically significant between two ads.
Have a mailing list and use email marketing to drive traffic to your website? Use this tool to compare different versions of your emails. You can analyze read rate and click through rate to see which of your emails is getting through to your customer base and driving your bottom line.
