ChinaStock.mat consists of the weekly close price of four Chinese companies (i.e. Tencent, JD, Baidu, Alibaba) over a year (Apr. 2, 2021 - Apr. 2, 2022). Please write a user-dened function LogReturn (P) that computes the log return by: rt = ln(Pt+1=Pt); where rt is the return of week t, Pt+1 and Pt are close price of week t + 1 and t, respectively. Use Matlab to answer the following questions: (a) Compute weekly log returns for each company. (b) Compute the average return and the average positive return for each company. (c) Find the total number and the index of the weeks that all four companies' returns are below -5%. I need a help to get a code in solving the question

Hey @Martin Njagi, To calculate the log returns from stock prices, you can follow these steps. Log returns are often preferred in financial analysis because they are time-additive and can be more stable than simple returns.Steps to Calculate Log Returns

Load the Data: First, load your data, which consists of the weekly closing prices of the stocks.
Calculate Log Returns: Use the formula for log returns:

Log Return = log(P_t / P_(t-1))

where ( P_t ) is the price at time ( t ) and ( P_{t-1} ) is the price at the previous time period.

3. Store the Results: Store the log returns in a new matrix or table for further analysis.