I am using QGIS. I've been calculating weighted means based off a database. The database was created by combining two different sets of Data together. The Attribute Table then shows Null values for two reasons: (1) mismatch while joining the two databases together and (2)missing values within the databases themselves.
I have tried to find a logic in the effects Nulls values have on the weighted means but have failed to come to a solid conclusion. They definitely do not act as a ZERO value.
I came across this post in reference to my search: Null values in Geographically Weighted Regression Analysis
It helped explain a lot of things, however this sentence "A null means something entirely different than zero" is the answer to which I am looking for.
What does a Null value mean in weighted mean centers?