![A stock price S is governed by the model In S(k +1) In S(k)w(k) where the period length is 1 month. Let v-Elw(k)] and ?2-var[w(k)] for all k. Now suppose the basic period length is changed to 1 year. Then the model is where each movement in K corresponds to 1 year. What is the natural definition of W(K)? Show that EW(K)]-12v and var[W(K)-12?2. Hence parameters scale in proportion to time.](https://d2vlcm61l7u1fs.cloudfront.net/media%2F680%2F680bbd1b-b7b6-48a6-8c1e-dafe87945f26%2FphpSJtguI.png)
A stock price S is governed by the model In S(k +1) In S(k)w(k) where the period length is 1 month. Let v-Elw(k)] and ?2-var[w(k)] for
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![A stock price S is governed by the model In S(k +1) In S(k)w(k) where the period length is 1 month. Let v-Elw(k)] and ?2-var[w(k)] for all k. Now suppose the basic period length is changed to 1 year. Then the model is where each movement in K corresponds to 1 year. What is the natural definition of W(K)? Show that EW(K)]-12v and var[W(K)-12?2. Hence parameters scale in proportion to time.](https://d2vlcm61l7u1fs.cloudfront.net/media%2F680%2F680bbd1b-b7b6-48a6-8c1e-dafe87945f26%2FphpSJtguI.png)
A stock price S is governed by the model In S(k +1) In S(k)w(k) where the period length is 1 month. Let v-Elw(k)] and ?2-var[w(k)] for
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