Simplest way to calculate your own beta to measure position weight allocation against portfolio or theme
This calculation can be used to figure out your beta of returns of closing price. Do this in order:
1. Download the closing price of your stock and index( i.e. S&P 500) to calculate returns
2. Use both returns to run a regression. Use Excel Data Analysis option plugin pack.
3. Calculate your output range with a plot. You should see a regression summary once calculated
4. To interpret the graph, you will see the returns with an observed regression line. This is caclulated by ordinary least squares. If the index is your x axis while the Y axis is the stock, it measures the response against the index. THe line is the gradient of the slope which measures if < 1, the beta amount could be calculated the stock is defensive.
5. The beta value is displayed in the summary. The R^2 is tha variation in returns of the stock. Beta x amount can mean the returns of the stock can be explained by the stock market from a statistical POV.
6. P-values of the X variable which is beta. If < 0.05, it is considered statistically insignificant. The P-value lets you know the probability that the beta could be 0.
Hope this helps somewhat
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