00:01
All right, so we're given this data about drug dependence in male twin pairs, and we're being asked to find the concordance rates for drug abuse in these different kinds of twins.
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So first we need to figure out what exactly are we looking at data -wise.
00:18
So there are two different types of twins.
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The words you may be most familiar with are going to be identical and fraternal.
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The more scientific jargon for these are monozygotic and dyezygotic.
00:50
And what this means is monozygotic, mono being the prefix for one.
00:55
This means that one egg is fertilized and it gets split into.
01:05
And this means that because they come from one egg, these twins share 100.
01:12
Percent of their genetic code.
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They are genetically identical.
01:22
However, di -zygotic twins means that you have two eggs that were fertilized, meaning that they only share 50 % of their genes, just like regular non -twin siblings.
01:42
So now that we understand the difference between this identical fraternal and monosyotic, dizigotic twins, what exactly is a concordance rate? so a concordance rate takes the concordant values as are given in the problem, and what you do is you divide that by the total...