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Two resolved peaks in a chromatogram. The theoretical plate height is given by = where L is the column length and N the number of theoretical plates. [5] The relation between plate number and peak width at the base is given by = ().
In order to calculate the average and standard deviation from aggregate data, it is necessary to have available for each group: the total of values (Σx i = SUM(x)), the number of values (N=COUNT(x)) and the total of squares of the values (Σx i 2 =SUM(x 2)) of each groups.
The variance per unit length of the column is taken as the ratio of the column length to the column efficiency in theoretical plates. The van Deemter equation is a hyperbolic function that predicts that there is an optimum velocity at which there will be the minimum variance per unit column length and, thence, a maximum efficiency. The van ...
The observations on the dependent variable are stacked into a column vector y; the observations on each independent variable are also stacked into column vectors, and these latter column vectors are combined into a design matrix X (not denoting a random vector in this context) of observations on the independent variables. Then the following ...
The second meaning of "aggregation problem" is the theoretical difficulty in using and treating laws and theorems that include aggregate variables. A typical example is the aggregate production function. [2] Another famous problem is Sonnenschein-Mantel-Debreu theorem. Most of macroeconomic statements comprise this problem.
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A Massachusetts high school football player was hospitalized with a “traumatic brain injury” following a “disturbing” injury during a game on Thanksgiving Day, according to local officials.
The 27-year-old gruesomly murdered the elderly woman in 2019 with ‘a hammer, a jab saw and a box cutter’