Is the Census underreported, and are there corrections?
I am aware that the census is not an exact population measurement as it is a survey.
However, I have been unable to find any information about the estimate of how under reported the census is believed to be, I say under reported because I have known a few people that have never filled out the form or returned it.
Now that the preface is out of the way the question is:
As the census is used to help determine district lines, public service funding, congressional seating, and various other things what is the estimated under reported rate and are there any corrective actions used when parsing the data, such as weighing a certain group or location more than another, in order to account for the difference and provide more accurate information or is it just used as is with direct number comparison?