>Calculating the average value for some observation in a time bucket, where some buckets may have no observation (resulting in 0/0=nan) But there are many ways

>Calculating the average value for some observation in a time bucket, where some buckets may have no observation (resulting in 0/0=nan) But there are many ways such a calculation could result in NaN besides a division. For example, intermediate sums could result in something like inf - inf. I find it rare that you can definitely conclude that a NaN means some specific thing.