Analytic dashboards are only visible to the user who creates them and to ngSurvey administrators. However its possible to grant access to any other users of the system and to define what the user can do with the dashboard .
Navigate to your project folder where you saved your dashboard
Select its access rights
Add the users or group to the list of trusted people who can access that dashboard and define which permissions you would like to grant to that user or group.
ngSurvey supports a special user called "Everyone". Granting access to that user will grant access to any users of your ngSurvey setup.
The owner of the dashboard will be able to define access rights along with any system administrator.