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Ascertainment Bias
A possible form of the bias, mainly in retrospective studies, which arises from a relationship amongst the exposure to the risk factor and the probability of detecting the event of interest. In a study comparing women by means of cervical cancer and a control group, for instance, an excess of oral contraceptive use among the cases might possibly be due to more regular screening for disease prevailing among the women are known to be taking the pill.
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Definition of statistics according to Prof. Ya lu chan
Choose a topic that interests you that you can explore either with the 2006 GSS. You should have one primary "dependent" variable that you are interested in (Y). This variable shou
FUNCTION SIMPLE AGGREGATIVE, SIMPLE RELATIVE
The probability a computer will boot is .08. What is the least number needed so that the probability at least two will boot is greater than .99?
1. If each sample taken has 500 units, and the average proportion nonconforming is 0.034, what is the upper and lower control limits for the p-chart? 2. If you sample 450 parts
Isotopes Elements having same atomic number Z, but different A mass number for example 126C, 146C and 11H 21H, 31H are isotopes of carbon and hydrogen. Isotones Elements havi
The BBC hosts a homophone quiz on its website; your task for this lab is to develop an automatic method for completing the quiz, with the aim being to get as high a score as possib
what is accounting ?
In 2009, the average number of runs scored in the National League was approximately 4.5 per team. Therefore, a team has done an adequate job with its offense if it scores at least
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