Like most things over the last year, the primary cause here seems to be the pandemic.
According to Next TV, it also eliminates any households that are no longer watching television or don’t have a functioning television.
To make sure its sampling is as accurate as possible and the data is being collected properly, Nielsen reportedly sends representatives into people’s homes to check for any issues.
In ordinary times, the company monitors a representative sample of homes to measure their TV viewing habits, and it uses this sampling to estimate how many total people across the United States watched a particular program.