public IEnumerable <CountryGwpItem> FindCloseAverageGwpPeers(string country, string lineOfBusiness, int yearStart, int yearEnd, int peersToReturn)
{
CountryGwpItem selectedCountry = _countryGwpItems.FirstOrDefault(c => c.Country == country && c.LineOfBusiness == lineOfBusiness);
var selectedCountryAvgGrowthRate = CountryGwpBusinessModel.GetAverageGrowthRate(selectedCountry, yearStart, yearEnd);
var peers = _countryGwpItems
.Where(p => p.LineOfBusiness == lineOfBusiness)
.OrderByDescending(p => SqrRootDistanceToAvgGrowthRate(selectedCountryAvgGrowthRate, p, yearStart, yearEnd))
.Take(peersToReturn);
return(peers);
}
private double SqrRootDistanceToAvgGrowthRate(double selectedCountryAvgGrowthRate, CountryGwpItem countryGwp, int yearStart, int yearEnd)
{
return(Math.Sqrt(Math.Pow((selectedCountryAvgGrowthRate - CountryGwpBusinessModel.GetAverageGrowthRate(countryGwp, yearStart, yearEnd)), 2)));
}