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Can get "residual sum of squares" #39

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ca97a5f
Can get "residual sum of squares"
lamrongol Jan 23, 2025
fa6ef2f
Init by `go mod` and remove ".travis.yml"
lamrongol Jan 23, 2025
df95bdb
Update gonum version.
lamrongol Mar 28, 2025
9eb3c82
Update Go version
lamrongol Mar 28, 2025
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11 changes: 0 additions & 11 deletions .travis.yml
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This file was deleted.

5 changes: 5 additions & 0 deletions go.mod
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
module github.com/lamrongol/regression

go 1.24.1

require gonum.org/v1/gonum v0.16.0
2 changes: 2 additions & 0 deletions go.sum
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
7 changes: 7 additions & 0 deletions regression.go
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Expand Up @@ -31,6 +31,7 @@ type Regression struct {
Formula string
crosses []featureCross
hasRun bool
residual_sum_of_squares float64
}

type dataPoint struct {
Expand Down Expand Up @@ -233,15 +234,21 @@ func (r *Regression) calcPredicted() string {
observations := len(r.data)
var predicted float64
var output string
r.residual_sum_of_squares = 0.0
for i := 0; i < observations; i++ {
r.data[i].Predicted, _ = r.Predict(r.data[i].Variables)
r.data[i].Error = r.data[i].Predicted - r.data[i].Observed
r.residual_sum_of_squares += r.data[i].Error * r.data[i].Error

output += fmt.Sprintf("%v. observed = %v, Predicted = %v, Error = %v", i, r.data[i].Observed, predicted, r.data[i].Error)
}
return output
}

func (r *Regression) GetResidualSumOfSquares() float64 {
return r.residual_sum_of_squares
}

func (r *Regression) calcVariance() string {
observations := len(r.data)
var obtotal, prtotal, obvar, prvar float64
Expand Down