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Bowls, also known as lawn bowls or lawn bowling, is a sport in which players try to roll their ball (called a bowl) closest to a smaller ball (known as a "jack" or sometimes a "kitty"). The bowls are shaped (biased), so that they follow a curved path when being rolled.
One side of the bowl has an indent or dimple allowing the player to identify by touch which side of the bowl has the bias. Crown green bowls come in a variety of bias strengths, weights, densities, sizes, materials and colours. The minimum weight is 2 lb (0.91 kg) but there is no maximum weight. [8] Bowls are referred to and sold by their ...
In outdoor bowls the jack has no bias, but in Crown Green bowls, the jack has a bias similar to the bowl itself. jack high: is a comparison of the position of a bowl in relation to the jack. A "jack high bowl" means a bowl whose front edge, which is closest to the bowler on the mat, is level with the front edge of the jack.
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If there is a consistent bias, it can be adjusted for by subtracting the mean difference from the new method. It is common to compute 95% limits of agreement for each comparison (average difference ± 1.96 standard deviation of the difference), which tells us how far apart measurements by two methods were more likely to be for most individuals.
Overmatching, or post-treatment bias, is matching for an apparent mediator that actually is a result of the exposure. [12] If the mediator itself is stratified, an obscured relation of the exposure to the disease would highly be likely to be induced. [13] Overmatching thus causes statistical bias. [13]
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