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Cubic nomogram construction

I

INC

New Member
Help requested. I have been trying to construct a nomogram for uroflowmetry. It is not a linear relationship between the maximum flow rate and flow time. How do I go about it?
 

Attachments

  • Hosmane construction-of-the-flow-rate-nomogram-using-polynomial-regression.pdf
    241 KB · Views: 9
  • siroky flow rate nomogram II 1980.pdf
    173.7 KB · Views: 8
INC

Firstly, Welcome to the Chandoo.org Forums

You should be able to put a chart together simply like these using your data
They are simple X-Y Scatter and an Area Chart

upload_2018-5-19_11-50-49.png

see attached file:
 

Attachments

  • Book1.xlsx
    21.8 KB · Views: 6
Hui said:
INC

Firstly, Welcome to the Chandoo.org Forums

You should be able to put a chart together simply like these using your data
They are simple X-Y Scatter and an Area Chart

View attachment 52287

see attached file:
Click to expand...
I don't get it. Do i have to calculate the mean and various SD for the two parameters and then plot that?
 
INC said:
I don't get it. Do i have to calculate the mean and various SD for the two parameters and then plot that?
Click to expand...
I don't have multiple uroflowmetric readings for the same voided volume. Single voids were taken.
 

Attachments

  • Changoo charts.xlsx
    35.1 KB · Views: 7
I have been rather busy at work this week and so haven't had a look at this
Is there anybody where you work who can help you with this ?
 
construct a nomogram
Click to expand...
I am confused as to what it is that you have been tasked with producing. As far as I can see the references you have provided are to standard charts rather than nomograms. That is, one looks up Volume and Flow Rate to determine a point on the chart and then estimates the number of standard deviations from the contours.

Am I correct in my assumption that you want a completely different representation in which you join the points on two (parallel) axes and read off the standard deviation from intersection of the new line with a calibrated curve?
 
It is possible to fit a log trendline to the data in the Hosmane et al. paper which could make constructing a nomogram somewhat easier since there are fewer parameters required to fit the curve.
 
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