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use MathNet lib to calc standard dev when choosing average price

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Dev 2023-06-29 12:36:11 +01:00
parent bfcff97fc5
commit 220fa4e5cc
3 changed files with 31 additions and 13 deletions
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38
MarketPriceLookup.Common/Helpers/MarketPricesHelper.cs
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@ -7,6 +7,8 @@ using System.Linq;
using System.Net.Http;
using System.Net.Http.Json;
using System.Text.Json;
using MathNet.Numerics.Statistics;
using System.Data;
namespace MarketPriceLookup.Common.Helpers
{
@ -101,28 +103,40 @@ namespace MarketPriceLookup.Common.Helpers
}
/// <summary>
/// Get items average flea price from all readings taken over the past 7 days
/// Get items average flea price from all readings taken over the past 14 days
/// </summary>
/// <param name="item"></param>
private static int GetAveragedPrice(Item item)
{
var sevenDaysAgoTimestamp = DateTimeOffset.UtcNow.AddDays(-7).ToUnixTimeSeconds();
var pricesWithinLast7days = new List<int>();
foreach (var historicalPrice in item.historicalPrices)
var fourteenDaysAgoTimestamp = DateTimeOffset.UtcNow.AddDays(-14).ToUnixTimeSeconds();
var filteredPrices = item.historicalPrices.Where(x => long.Parse(x.timestamp) > fourteenDaysAgoTimestamp).OrderBy(x=> x.price).ToList();
if (filteredPrices.Count == 0)
{
if (long.Parse(historicalPrice.timestamp) > sevenDaysAgoTimestamp)
{
pricesWithinLast7days.Add(historicalPrice.price);
}
// x day filter means no prices, use all data
filteredPrices = item.historicalPrices.ToList();
}
if (pricesWithinLast7days.Count == 0)
if (filteredPrices.Count == 1)
{
LoggingHelpers.LogError($"No prices found for item {item.name} in last 7 days, using any availible");
pricesWithinLast7days.AddRange(item.historicalPrices.Select(x => x.price));
return filteredPrices[0].price;
}
return (int)Math.Round(pricesWithinLast7days.Average());
var prices = filteredPrices.Select(x => (double)x.price).ToArray();
var avgMean = prices.Average();
var standardDev = prices.StandardDeviation();
var upperCutoff = standardDev * 1.5;
var lowerCutoff = standardDev * 2;
var lowerBound = avgMean - lowerCutoff;
var upperBound = avgMean + upperCutoff;
//var outliers = prices.Where(x => x < lowerBound || x > upperBound).ToList();
var pricesWithOutliersRemoved = prices.Where(x => x >= lowerBound && x <= upperBound).ToList();
return (int)Math.Round(pricesWithOutliersRemoved.Average());
}
public static Prices GetItemPrice(string key)

2
MarketPriceLookup.Common/Helpers/TarkovDevResponse.cs
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@ -17,7 +17,7 @@ namespace MarketPriceLookup.Common.Helpers
{
public string name { get; set; }
public int avg24hPrice { get; set; }
public double changeLast48hPercent { get; set; }
public double? changeLast48hPercent { get; set; }
public string id { get; set; }
public HistoricalPrice[] historicalPrices { get; set; }
}

4
MarketPriceLookup.Common/MarketPriceLookup.Common.csproj
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@ -4,6 +4,10 @@
<TargetFramework>net6.0</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="MathNet.Numerics" Version="5.0.0" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\MarketPriceLookup.Common.Models\MarketPriceLookup.Common.Models.csproj" />
</ItemGroup>