I think I get what you're trying to explain and this is what it means, you said you got 0.040 per day this is value gotten when the amount of post you have made is being divided by the number of days you have been on the forum.
For example let me say that you have been on the forum for about 10 days and you also have a total of 10 post made then the numbers of post will be divided by the number of days on the forum
Example: 10/10 = 1
That means in such situation what you will see there is 1 per day