Standard Deviation in LINQ

by

You can make your own extension calculating it

public static class Extensions
{
    public static double StdDev(this IEnumerable<double> values)
    {
       double ret = 0;
       int count = values.Count();
       if (count  > 1)
       {
          //Compute the Average
          double avg = values.Average();

          //Perform the Sum of (value-avg)^2
          double sum = values.Sum(d => (d - avg) * (d - avg));

          //Put it all together
          ret = Math.Sqrt(sum / count);
       }
       return ret;
    }
}

If you have a sample of the population rather than the whole population, then you should use ret = Math.Sqrt(sum / (count - 1));.

Transformed into extension from Adding Standard Deviation to LINQ by Chris Bennett.

More Related Contents:

  1. Multiple “order by” in LINQ
  2. Entity Framework: There is already an open DataReader associated with this Command
  3. Linq: adding conditions to the where clause conditionally
  4. How to filter nested collection Entity Framework objects?
  5. Only initializers, entity members, and entity navigation properties are supported
  6. Linq with group by having count
  7. LINQ Between Operator
  8. How to view LINQ Generated SQL statements?
  9. LINQ OrderBy versus ThenBy
  10. What’s the difference between IQueryable and IEnumerable [duplicate]
  11. How can I reject all changes in a Linq to SQL’s DataContext?
  12. How to use LINQ in C++/CLI – in VS 2010/.Net 4.0
  13. Sum of items in a collection
  14. How to dynamically add OR operator to WHERE clause in LINQ
  15. LINQ To SQL exception: Local sequence cannot be used in LINQ to SQL implementation of query operators except the Contains operator
  16. writing a custom comparer for linq groupby
  17. Linq To Sql – Dynamic OrderBy – Case When
  18. What Sorting Algorithm Is Used By LINQ “OrderBy”?
  19. How LINQ works internally?
  20. LINQ OrderBy not ordering .. changing nothing .. why?
  21. Multiple WHERE clause in Linq
  22. LINQ: Entity string field contains any of an array of strings
  23. ASP.NET Core & EntityFramework Core: Left (Outer) Join in Linq
  24. LINQ Include vs Join. Are they equivalent?
  25. Tradeoffs using NHibernate 3.0 QueryOver or LINQ provider
  26. If condition in LINQ Where clause
  27. Point connectionstring in dbml to app.config
  28. How to implement Unit of Work that works with EF and NHibernate
  29. Building Dynamic LINQ Queries based on Combobox Value
  30. NHibernate vs LINQ to SQL

Leave a Comment