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Hanspeter Helfer

Hanspeter Helfer's Public Library

    • Since r2 is a proportion, it is always a number between 0 and 1.
    • If r2 = 1, all of the data points fall perfectly on the regression line. The predictor x accounts for all of the variation in y!
    • If r2 = 0, the estimated regression line is perfectly horizontal. The predictor x accounts for none of the variation in y!
May 02, 15

1. Navigate to URL chrome://flags in Chrome.
2. Click 'Enable' under Enable NPAPI Mac, Windows
3. Restart the browser. User will now be able to Add Photos after selecting to enable the Silverlight plugin.

  • _(dt_year)
  • note the use of '_' as the alias for the APPLY rowset.
  • Note that the APPLY operator only contains an expression that uses a column in the rowset and aliases the result.

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  • Diff Commander allows you to compare more than two folders or zip-archives at a time.

  • Bei der Horizon Box ist dies nicht möglich.

  • Object.ReferenceEquals() has the same effect
  • operator==() on object types means reference equality. That is, a==b is true if and only if a and b reference the same object.
  • Object.Equals(a,b) is essentially the same as a.Equals(b), but it will not blow up if a is null.

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  • private void OnButton1Click(object sender, EventArgs e) {  this.Hide();  var form2 = new Form2();  form2.Closed += (sender, args) => this.Close();  form2.Show(); }

    • typeof takes a type name (which you specify at compile time).
    • GetType gets the runtime type of an instance.
    • typeof takes a type name (which you specify at compile time).
    • GetType gets the runtime type of an instance.
    • is returns true if an instance is in the inheritance tree.
  • obj as Foo;

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  • WebPage1 inherits from Page, and this one inherits also from
     Object, so if you test for (new WebPage1()).GetType() ==
     typeof(object) it'll return false because the types are diferent, but
     when you test using the IS operator it's true.
  • The types might be different, but IS checks if you can cast safely to
     this type.
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