- Paul Aveyard
- Registrar in public health Warwickshire Health, Warwick CV34 4DE
Survey data have their problems too
EDITOR,--Glen Scrivener and David C E F Lloyd conclude that the linkage of general practice data and census data is too inaccurate to use,1 But this conclusion is not warranted by their findings. Whether such linkage is too inaccurate depends on the use in question and is a personal judgment; it cannot be determined by the correlation coefficient. Furthermore, by using correlation the authors fail to display the limits of the agreement …
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