For First Responders · Linear Regression
Linear Regression for a spam filter
Built for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field. Simulate a spam filter live below — adjust the inputs and watch it respond, right in your browser.
Linear RegressionLive
least squares & R²
Controls
Presets
Ordinary least squares finds the line that minimizes the sum of squared vertical residuals (the gray drop-lines). R² measures the fraction of variance the line explains — 1 is perfect, 0 is useless. Add noise or remove points to watch the fit and R² degrade.
Data Inspector
Fitted slope0.000
Intercept0.000
R²0.000
Correlation r0.000
Governing equation
Reading this result: R² = 0.00: noise (2) swamps the signal, so least squares can barely tell the slope from flat — adding data points would tighten the estimate.
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
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Frequently asked questions
- Is this good for first responders?
- Yes — this version of "Linear Regression for a spam filter" is framed for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field.
- Do I need to install anything?
- No. It runs in any modern browser, free, with no account required.