Iraq dominated the headlines throughout the fall of 2002 and into the winter of 2003. Public opinion on the wisdom of war, however, stabilized relatively early and slightly in favor of war. Gallup found that from August 2002 through early March 2003 the share of Americans favoring war hovered in a relatively narrow range between a low of 52 percent and a high of 59 percent. By contrast, the share of the public opposed to war fluctuated between 35 percent and 43 percent.
Looks like Americans are even more happy with murdering people if its done by a puppet.
A random sample of mobile phone users isn’t a random sample, because you’re only going to get the people who answer texts from strangers.
It’s called “non-response bias” and it’s a huge part of the reason political polling doesn’t work. It’s strong enough to render almost any sample from a phone survey non-representative.
Yeah I understand that there’s a difference between the sampled population and the actual population of interest, but you can’t discount the results of on account of that unless you can meaningfully show a non-zero covariance between the response variable and likelihood of non-response.
By all means it’s a caveat but it doesn’t make these results entirely non-informative.
In any case I cited iid conditions to explain why asking all their friends is certain to produce a useless estimate of the population proportion.
They know that asking their friends is useless. They were trying to make a point about sampling bias.
