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Keflex 500mg, A customer contacted us about computing "variance inflation factors".
Wikipedia defines this as:
In statistics, keflex 100 mg, Keflex capsules 500mg, the variance inflation factor (VIF) is a method of detecting the severity of multicollinearity. More precisely, pen vk 250, Pen vk 250 mg, the VIF is an index which measures how much the variance of a coefficient (square of the standard deviation) is increased because of collinearity. [Ref]
Here's an implementation using CenterSpace's NMath and NMath Stats libraries, pen vee k 250 mg. Keflex 500 mg dosage,
// Returns all the variance inflation factors
private static DoubleVector Vif( LinearRegression lr )
{
// iterate through predictors and find variance
// inflation factor for each
DoubleVector factors =
new DoubleVector( lr.NumberOfPredictors );
for (int i = 0; i < lr.NumberOfPredictors; i++)
{
factors[i] = Vif( lr, i );
}
return factors;
}// Returns a single variance inflation factor
private static double Vif( LinearRegression lr, penicillin v 250 mg, Keflex pulvules 500mg, int i )
{
// remove predictor, change observation
LinearRegression lr2 = (LinearRegression)lr.Clone();
lr2.RemovePredictor( i );
lr2.SetRegressionData( lr2.PredictorMatrix, cephalexin 500 mg for dogs, Keflex 750 mg dosage, lr.PredictorMatrix.Col( i ), true );// calculate variance inflation factor
LinearRegressionAnova anova =
new LinearRegressionAnova( lr2 );// return factor
return 1.0 / (1.0 - anova.RSquared);
}
And here's an example using these functions:
DoubleMatrix independent = new DoubleMatrix(
"30x3[0.270 78 41 0.282 79 56 0.277 81 63 " +
"0.280 80 68 0.272 76 69 0.262 78 65 " +
"0.275 82 61 0.267 79 47 0.265 76 32 " +
"0.277 79 24 0.282 82 28 0.270 85 26 " +
"0.272 86 32 0.287 83 40 0.277 84 55 " +
"0.287 82 63 0.280 80 72 0.277 78 72 " +
"0.277 84 67 0.277 86 60 0.292 85 44 " +
"0.287 87 40 0.277 94 32 0.285 92 27 " +
"0.282 95 28 0.265 96 33 0.265 94 41 " +
"0.265 96 52 0.268 91 64 0.260 90 71]" );DoubleVector dependent =
new DoubleVector( "0.386 0.374 0.393 0.425 " +
"0.406 0.344 0.327 0.288 0.269 0.256 0.286 " +
"0.298 0.329 0.318 0.381 0.381 0.470 0.443 " +
"0.386 0.342 0.319 0.307 0.284 0.326 0.309 " +
"0.359 0.376 0.416 0.437 0.548" );LinearRegression regression =
new LinearRegression( independent, keflex 100 mg, Pen vk 250 mg, dependent, true );
Console.WriteLine( "Is good, keflex 750 mg dosage. Amoxicillin 500 mg sinus infection, " + regression.IsGood );
LinearRegressionAnova anova =
new LinearRegressionAnova( regression );
Console.WriteLine( "variance: " + regression.Variance );
Console.WriteLine( "r-squared: " + anova.RSquared );
DoubleVector vif = Vif( regression );
Console.WriteLine( "variance inflation factors: " + vif );
-Trevor
Note: This functionality is now in NMath Stats. Keflex 500 mg dosage. Cephalexin 500 mg for dogs. Pen vk 250. Keflex capsules 500mg. Keflex pulvules 500mg. Keflex 500 mg qid. Keflex 500mg dosage. Penicillin v 250 mg. Pen vee k 250 mg. Cephalexin 500 mg for dogs. Keflex 500mg dosage.
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Tags: Computing variance inflation factors, Variance Inflation factors, vif
