Question 2. Consider a p-dimensional response variable j, containing p variables, with n observation vectors j1,..., n. The sample mean vector of these observation vectors is denoted by = (1/n) -1 F. Consider a linear combination v of the observation vector j, defined as v = a1y1 + a2y2 + .+ apyp = d'j where aT = (a1, a2, . . . , ap). i) Show that the mean of v is v = a

Classical Dynamics of Particles and Systems
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ISBN:9780534408961
Author:Stephen T. Thornton, Jerry B. Marion
Publisher:Stephen T. Thornton, Jerry B. Marion
Chapter4: Nonlinear Oscillations And Chaos
Section: Chapter Questions
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Question 2. Consider a p-dimensional response variable j, containing p variables, with n observation
vectors j1,.., Tn. The sample mean vector of these observation vectors is denoted by j = (1/n) Ji.
Consider a linear combination v of the observation vector j, defined as
v = a1y1 + a2Y2 + + ap Yp =
where äT = (a1, a2, . .., ap).
i) Show that the mean of v is ī = aTj
ii) Using the results of the previous question and given that
E, (vi – 0)²
n - 1
show that
s? = aT Sa
where S is the sample covariance matrix of the random vector j.
[Hint: Try writing all the v variables in terms of the corresponding vectors j.]
Transcribed Image Text:Question 2. Consider a p-dimensional response variable j, containing p variables, with n observation vectors j1,.., Tn. The sample mean vector of these observation vectors is denoted by j = (1/n) Ji. Consider a linear combination v of the observation vector j, defined as v = a1y1 + a2Y2 + + ap Yp = where äT = (a1, a2, . .., ap). i) Show that the mean of v is ī = aTj ii) Using the results of the previous question and given that E, (vi – 0)² n - 1 show that s? = aT Sa where S is the sample covariance matrix of the random vector j. [Hint: Try writing all the v variables in terms of the corresponding vectors j.]
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