Hi Robert, Welcome to the forum. First up, apologies - we tend to be a bit of a backwater, so it can be weeks before a post gets answered. Secondly, I'm no mac expert, but I figured that suggesting something while we're waiting for a mac expert to show up would be no harm. :-) Caveats out of the way...

I'll admit, I haven't yet delved into your algebra - hopefully I might get a chance over the weekend...

J

Not sure. I've tried lining the new scale up with no conversion factor - so essentially you should get the same scale on either side - but even that doesn't completely line up. :( Perhaps some of the other members may have a clue (you may have noticed, it's a slow moving forum!) I think the numbers ...

Hello again! Gosh, you've been busy. And that's turning into a really nice nomogram. I'd suggest tidying up the scale lengths: the bottom section of the B1 scale doesn't appear to be serving much function - I'd either chop it off or extend B0. But you're the expert. :-) When it's done, I'd suggest t...

Hi William, Welcome aboard. There's a short answer and a long answer - I'm off to catch a boat, so I'll give the short one. I'll post the longer one in a few days if no-one beats me to it. There are transforming constants you can apply to your determinant, but I'd have to look them up. Abbott or Lev...

This one has a compound nomogram to calculate Lean Body Mass and Ideal Body Weight in overweight children. (Ideal is what you should weigh; lean is what you weigh without your fat. Overweight people often have more muscle bulk, as a result of carrying the extra weight around, so lean and ideal are d...

It's been a long time coming, but the full nomogram I was working on here has finally made it into print. http://onlinelibrary.wiley.com/doi/10.1111/anae.12860/full Leif, you'll be glad to hear that you're mentioned in the acknowledgements.

Jason

Why thank you, sir.

(Adds 'nifty' to log of accolades received.)

Sadly, neither the Burns or BJS article is free, but as they're both major journals, most institutions will have access.

Jason

Nomodave and I have had a number of successful publications recently in the medical literature with Pynomo-based nomograms. Unfortunately most of the are pay-for-access (you may have institutional access, depending on where you are) but this one in Anaesthesia is open access: http://onlinelibrary.wi...

I've plumbed all this into Pynomo and the result is below. Glen, I've swapped the first two columns of the determinant around to make the axes vertical and I've put in the actual names of the variables. (Bit of an explanation: PaO2 is measured oxygen in your blood, FiO2 is the level of oxygen you br...

Oh bother. Thought I had it!

Not often I get to be the clever one around here.

Determinant:
0__________V_________1
1__________[6a-a²]_______1
[h/(h+1)]__[12h³/(h+1)]___1

It's a standard type 4 determinant as described by Levens, or Genus 1 as described by Alcock and Jones. The formula just translates directly across.

Jason

dave, you need to check your e-mails!

Hi Glen,

Well, I've gone over the algebra, and yes, you're right (unless I too have made exactly the same mistake!) Thanks for this. Will let you know how I get on with pynomo. (Wayyy to tired tonight.)

I love curved axes, btw

Jason

Thanks Ron.

I must give credit where it's due - that article was one of the first works I read on the topic, and I'm still learning from it.

Jason