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The health service is improving by leaps and bounds? Schools are doing a fantastic job? We've all got more money to spend than ever? We just don't believe the figures any more, there's a funny smell about them.
A lot of the time, they just don't chime with our personal experience, or our friends' experience. The health service has never been better? So how come Uncle Ted has been waiting six months for a heart op? How come I've been waiting nine for physiotherapy?
The fact is that too many people have a vested interest in cooking the figures to their own advantage. Politicians looking for votes. Drug firms dependent on safe medicines. Police forces expected to solve crimes. If the stats look bad, they'll give them a little tweak in the right direction.
We all know examples of people being caught with their pants down. When A&E waiting times dramatically decreased it was discovered that senior managers had stealthily improved them by falsifying admission and treatment records. The figures were worthless.
Individuals are no more reliable. If someone's asked how often they have sex, "Several times a week" is a lot more likely than "Actually, I can't get it up. I've been a washout for six months." Who freely admits their failings and weaknesses?
Statistics gathered by reputable academics with no axe to grind may be 100% legit. Unfortunately these principled souls are thin on the ground.
So those precise-looking figures may look good in a newspaper headline. They may be presented by a jolly authoritative chap in a smart suit from the Institute of Something-Or-Other. But most of us take them with a bucketload of salt and think "Sure. So who stands to gain? Where's the pay-off?"
(Bet you didn't know that 57% of estate agents are transvestites, 23% suck their thumbs and 39% are satanists? Who'd have thought it?)
NB: This post was completely rewritten on 17.10.08