Originally posted by vetran
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My point being that picking just SKY customers will invariably introduce bias.
E.g. Look at this:
http://www.barb.co.uk/download/?file...rch-2016-1.pdf
Cable customers are biased towards the older (maybe wealthier?) generations - 18-34 year olds for example are less likely to have cable, so would be excluded from polling. Students are unlikely to be SKY cable customers.
Virgin customers may have a different demographic from Sky, you'd exclude them too.
Many (poorer?) people just have FreeView, you'd exclude them.
According to that report more and more tech savvy people are accessing TV srevices via the internet, you'd be exclduing them
And so on.
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