Vancore said he uses a system that sends text messages with links that respondents can use to complete the surveys from their phones. And an internet-only poll would miss many older and poorer people. Simply asking people to fill out a survey online isn’t valid, because then it’s not random the sample would come from people who decided they want to participate and wouldn’t be representative. But that’s expensive, and many people don’t answer unfamiliar numbers, so some pollsters are using combinations of live calls, automated calls to cellphones, and digital components. The gold standard of polling this century has been considered live calls to landlines and telephones. People who rely exclusively on mobile phones tend to be younger. In the last two decades, many people have given up landlines, and those who still do have them tend to be older. In a bygone era in which almost every household had a landline telephone and people answered their phones it was much easier to get a good sample by randomly calling from the pool of every phone number in use. It’s impossible to sample all a person’s blood, but a drop can reveal if a diabetic’s blood sugar is too high or a lab sample can reveal if someone has high cholesterol. Vancore likened it to getting a blood test.
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