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Re: 12AU7 tube heater model

 

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It¡¯s a somewhat obscure figure of merit in statistical analysis.

An R^2 of 1.00 is as near perfect fit as possible, of a formula to a set of data.

Anything close to that, is ¡°close enough!¡±

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Dave

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From: [email protected] <[email protected]> On Behalf Of Carlo
Sent: Saturday, February 22, 2025 9:38 AM
To: [email protected]
Subject: EXTERNAL: Re: [LTspice] 12AU7 tube heater model

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On Sat, Feb 22, 2025 at 08:14 AM, John Woodgate wrote:

A bit of Excel work gives a resistance trend line (for voltages between 3.0 and 6.5)? R = 0.22*V^2 + 3.61*V + 6.50. The R^2 (accuracy measure) = 0.9993, good enough for government work.

Sorry, what does R^2 accuracy measure of 0.9993 actually mean ?

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Thanks.
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