OPEN-SOURCE SCRIPT

10yr, 20yr, 30yr Averages: Month/Month % Change; Seasonality

Updated
Calculates 10yr, 20yr and 30yr averages for month/month % change

~shows seasonal tendencies in assets (best in commodities). In above chart: August is a seasonally bullish month for Gold: All the averages agree. And January is the most seasonally bullish month.
~averages represent current month/previous month. i.e. Jan22 average % change represents whole of jan22 / whole of dec21
~designed for daily timeframe only: I found calling monthly data too buggy to work with, and I thought weekly basis may be less precise (though it would certainly reduce calculation time!)
~choose input year, and see the previous 10yrs of monthly % change readings, and previous 10yrs Average, 20yr Average, 30yr Average for the respective month. Labels table is always anchored to input year.
~user inputs: colors | label sizes | decimal places | source expression for averages | year | show/hide various sections
~multi-yr averges always print, i.e if only 10yrs history => 10yr Av = 20yr Av = 30yr Av. 'History Available' label helps here.

Based on my previously publised script: "Month/Month Percentage % Change, Historical; Seasonal Tendency"
Publishing this as seperate indicator because:
~significantly slower to load (around 13 seconds)
~non-premium users may not have the historical bars available to use 20yr or 30yr averages =>> prefer the lite/speedier version

~~tips~~
~after loading, touch the new right scale; then can drag the table as you like and seperate it from price chart

##Debugging/tweaking##
Comment-in the block at the end:
~test/verifify specific array elements elements.
~see the script calculation/load time

~~other ideas ~~
~could tweak the array.slice values in lines 313 - 355 to show the last 3 consecutive 10yr averages instead (i.e. change 0, 10 | 0,20 | 0, 30 to 0, 10 | 10, 20 | 20,30)
~add 40yr average by adding another block to each of the array functions, and tweaking the respective labels after line 313 (though this would likely add another 5 seconds to the load time)
~use alternative method for getting obtaining multi-year values from individual month elements. I used array.avg. You could try array.median, array.mode, array.variance, array.max, array.min (lines 313-355)
Release Notes
show current month as different color and label size.
Release Notes
Fixed occastional double-print glitch by changing from barstate.islast to barstate.islastconfirmedhistory
Release Notes
-includes options for Volume (sma of volume) and Volatility (bollinger band width); comparing monthly % changes. Note: volume will not work on most FX pairs (no volume data there)
Release Notes
-updated to use Tables
Release Notes
-cleaned up code comments
Release Notes
-added warning message if user is NOT on daily timeframe
averagebacktestingCommoditieshistoricalMonthly ChartsmonthlyanalysispercentagechangeseasonaltendenciesseasonaltradestatisticsTrend Analysis

Open-source script

In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in publication is governed by House rules. You can favorite it to use it on a chart.

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