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Chains of infection: The description of the course of infection among the group of individuals. The susceptibles infected by the direct contact with the introductory cases are said to make up the ?rst generation of cases; the susceptibles infected by the direct contact with the ?rst generation are said to make up the second generation and and this carries on. The enumeration of the number of cases in each generation is said to be an epidemic chain. Hence the sequence 1-2-1-0 denotes the chain comprising of one introductory case, the cases in ?rst two generation, one case in second generation and no cases in the later generations.
A procedure whereby the collection of multiple sample units are combined in their entirety or in part, to form the new sample. One or more succeeding measurements are taken on the
calculate the mean yearly value using the average unemployment rate by month
The method or technique for displaying the relationships between categorical variables in a type of the scatter plot diagram. For two this type of variables displayed in the form o
Pascal's triangle is an arrangement of numbers described by Pascal in his Traité du Triangle Arithmétique published in the year 1665 as 'The number in each cell is equal to in the
Raking adjustments is an alternative to the post stratification adjustments in the complex surveys which ensures that the adjusted weights of the respondents conform to each of th
A law supposedly applicable to voting behaviour which has a history of several decades. It may be stated thus: Consider a two-party system and suppose that the representatives of t
Suppose we estimate the following model: Passengersi = 1 + 2Populationi + ui a) Generate a scatter plot with passengers on the vertical axis and population on the horizonta
Kendall's tau statistics : The measures of the correlation between the two sets of rankings. Kendall's tau itself (τ) is the rank correlation coefficient based on number of inversi
An oil company is considering whether or not to bid for an offshore drilling contract. If they bid, the value would be $600m with a 65% chance of gaining the contract. The company
how to constuct design matrix
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