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jason-neal / companion_simulations

Simulating combined host+companion spectra, and fitting to observed crires spectra.
MIT License
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Lithium 6 parabola #15

Open jason-neal opened 7 years ago

jason-neal commented 7 years ago

Nuno suggests making a parabola line his lithium 6 paper.

For each parameter. Pick the chi2 value that is smallest and we should get a parabola.

He also suggest adding a variable normalization that is thrown away at the minimum chi2. I could add another broadcasted parameter and multiple 1 model or obs by 0.98 and 1.02 and then reduce back to minimum chi 2 for each.

jason-neal commented 7 years ago

scipy.stats.chi2(df).isf(1-probability) is used to determine the chi2 values to use.

e.g. (df, prob)
(1, 0.68 (1 sigma)) = 1 (3, 0.99 (3 sigma) = 11.30
This can produce the chi2 table.

From AVNI 1976 you go up the chi2 value from the minimum chi2 to reach the parameter values for the given confidence levels.

jason-neal commented 7 years ago

Take the difference Delta chi2 from minimum value