Jinx Covariance

This script calculates and plots the covariance between the closing price of the current trading symbol and the closing prices of several major US stock market components over a user-defined lookback period.
Here's a breakdown:
* Indicator Initialization: The script starts by defining an indicator named "My script".
* Array Declaration: Nine empty arrays (a1 to a9) are created to store historical closing prices.
* Security Data Request: The script then requests historical closing price data for the following symbols using the same timeframe as the current chart: DJI (Dow Jones Industrial Average), SPX (S&P 500), AAPL (Apple), GOOG (Alphabet Inc. Class C), GOOGL (Alphabet Inc. Class A), AMZN (Amazon), META (Meta Platforms), and MSFT (Microsoft). These are stored in variables as2 through as9.
* Data Population Loop: A for loop runs for a number of bars specified by the "Lookback" input (defaulting to the last 100 bars). In each iteration:
* The closing price of the current symbol (close) is added to the array a1.
* The closing prices of the requested securities (as2 to as9) are added to their respective arrays (a2 to a9).
* Covariance Calculation: After the loop, the script calculates the covariance between the array of the current symbol's closing prices (a1) and the array of closing prices for each of the other securities (a2 to a9). The results are stored in variables a1a2 to a1a9.
* Plotting Covariance: Finally, the script plots each of the calculated covariance values on the chart:
* For DJI, the covariance is plotted with the title "DJI". The color of the plot is aqua if the current covariance is greater than the covariance 10 bars ago, and red otherwise. This plot is displayed only in the data window.
* For SPX, the covariance is plotted with the title "SPX". The color is black if the current covariance is greater than the covariance 10 bars ago, and red otherwise. This plot is also displayed only in the data window.
* For AAPL, GOOG, GOOGL, AMZN, META, and MSFT, the covariance is plotted with their respective ticker symbols as titles. The color of each plot changes between a specific color (blue, fuchsia, lime, gray, maroon, navy respectively) and red, depending on whether the current covariance is higher than it was 10 bars prior.
In essence, this script visualizes how the current symbol's price movement correlates with the price movements of these major indices and stocks over the defined historical period. The color change on the plots indicates whether the covariance has increased compared to 10 bars ago, potentially suggesting a strengthening or weakening of the correlation. The display setting for DJI and SPX means their covariance values will only be visible in the data window panel at the bottom of the TradingView chart, not as lines directly overlaid on the price action.
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