I would love to see a rolling average helper. Playing around with the sleep confidence sensor that comes with the Companion app and I feel a rolling average helper could help alot with parsing out the noise from the data .
Side note: is there a way to make your own custom helper types?
Which one of the sensors in there could I achieve it with ? 
I scimmed through it earlier but none seemed to fit the bill.
As a sidenote on the feature request, it seems to me that most of the sensors in there would be easy targets to make helpers out of.
I too would like to see a dedicated UI helper to easily calculate moving averages for sensor data. I use the Statistics Integration which requires editing the YAML file. This is helpful to reduce noise from intersecting temperature trends (i.e. outside vs inside temperature), etc. Editing the YAML is unfortunate especially when configuring HA remotely. Surprised this helper has been so delayed.
+1,000,000 to this just being a Helper with a UI to set up. Makes total sense, and I’d probably use it more than any other helper.
Another vote for this. Statistics integration is a little cumbersome when you want a rolling average for so many things, that’s a ton of configuration.
I just want the ability to get rolling average for any existing sensor in an automation to perform an action based on it as an integer. Rather than look at current light levels in the living room i want running average for the past 10 minutes. Rather than power consumption at the moment I want running average of the last 5 minutes.
Something easier than setting up a parallel integration every time would be helpful.