Evaluate the effectiveness of your forms from within Google Analytics by setting up a Goal around the submit event. More information on goals can be found here.
Enable the Google Analytics plugin on your Formstack form. More information on how to do this can be found here .
Sign into your Google Analytics account and click "Admin" at the top of the screen.
Then click "Goals", then the red "+New Goal" button.
Next, choose "Custom" at the bottom of the "Goal Setup" step and click "Continue".
At the "Goal Description" step, name your goal and choose "Event" as the type. Click "Continue".
At the "Goal Details" step fill out only the "Category" and "Action" fields.
The Category will be "Formstack Form {Your Form ID}. Ex. Formstack Form 2109074
To find the unique ID of your form, go to the Settings tab of a form in your account, and look in the URL bar for the ID number.
The Action will simply be the word "submit".
Keep the conditions set to "Equals To".
Set the "Use the Event value as the Goal Value for the conversion" slider to "Yes" and click the "Verify this Goal" to check to see if the goal would have converted based on your prior data. This is a great way to make sure the Goal is set up correctly.
Click "Save" and you've just created a goal around the Submit event of your form!
Return to Admin > Goals to view your current goals. It will take 24 hours for data to start recording.
Note: Formstack also provides excellent analytics and won't truncate data the way Google Analytics does (https://support.google.com/analytics/answer/2637192?hl=en).
The main issue here is that GA samples data and doesn't provide a perfect understanding of user traffic. Formstack, on the other hand, will provide data from a perfect data set and won't sample your data.