FundamentalRatio-with-sum-of-last-items-over-N-months

I'm not sure if the "4" should be a "3" below. I would check the output with a calculator. I don't calculate P/E ratio using this call.

The declaration for peRatio is placed in the MyStrategy "parent" {block} so it automatically becomes visible in both the Initialize and Execute "child" blocks, as standard C# scoping rules require.

CODE:
using WealthLab.Backtest;
using WealthLab.Core;
using WealthLab.Indicators;

namespace WealthScript4 
{
   public class MyStrategy : UserStrategyBase
   {
      FundamentalRatio peRatio;
      
      public override void Initialize(BarHistory bars)
      {
         peRatio = new FundamentalRatio(bars,"Close","Earnings",4,12);
         PlotIndicator(peRatio);
      }

      public override void Execute(BarHistory bars, int idx) { }
   }
}

QUOTE:
The last 4 fundamental items that have dates within the last 12 months are added together ...

Sometimes there's an out-of-band dividend added so one really needs to add the last 5 fundamental items up to get the proper result in these cases. There is a question as to how the "bonus" dividend should be accounted for?

I have a special notation from two years ago (in my local library code) saying to use "3" instead of "4" when computing "Price/Cash Flow ratio". I'm not sure what was going on there.

CODE:
FundamentalRatio priceCashFlowRatio = new FundamentalRatio(bars, "Close", "free_cash_flow", 3, 12, sharesOutstanding); //sumLastNItems=3 yields an SMA(4) of the events (quarters)