#### Unusual Y Axis Scale Question

```I am trying to create what is referred to in the medical literature as a
"reciprocal creatine curve." The data is rather simple -- just serum
creatinine values (Y-axis) over time (X-axis), but the Y-axis scale is quite
unusual. The scale is not linear and it's not logarithmic. It's a scale in
which the values appear to constantly accelerate. Thus, the distance between
1 and 2 is greater than the distance between 2 and  3, the distance between
2 and 3 is greater than the distance between 3 and 4, etc. Toward the very
top of the Y-axis the incremental distance between values becomes
infinitesimally small.

Is this scale possible to recreate in Excel? Any help is sincerely
appreciated.

```
 0
2/8/2004 6:42:06 PM
excel.charting 18370 articles. 0 followers.

6 Replies
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```Hello Gene,
If you can plot it manually we expect to be able to do it in Excel. But you
are asking a lot of this group - you have not told us what to plot. Are you
thinking of the Michaelis Menten equation? Or is it some other function of
[S] that needs to be worked out?

--
Bernard Liengme
www.stfx.ca/people/bliengme

"Gene" <gene.cooney@cox.net> wrote in message
news:u0kZCTn7DHA.1504@TK2MSFTNGP12.phx.gbl...
> I am trying to create what is referred to in the medical literature as a
> "reciprocal creatine curve." The data is rather simple -- just serum
> creatinine values (Y-axis) over time (X-axis), but the Y-axis scale is
quite
> unusual. The scale is not linear and it's not logarithmic. It's a scale in
> which the values appear to constantly accelerate. Thus, the distance
between
> 1 and 2 is greater than the distance between 2 and  3, the distance
between
> 2 and 3 is greater than the distance between 3 and 4, etc. Toward the very
> top of the Y-axis the incremental distance between values becomes
> infinitesimally small.
>
> Is this scale possible to recreate in Excel? Any help is sincerely
> appreciated.
>
>

```
 0
bliengme5824 (3040)
2/8/2004 11:57:06 PM
```Thanks for the reply, Bernard.

The data that needs to be plotted as actually quite simple. They are serum
creatinine values (a measure of kidney function) over time. E.g.:

Jan. 1 => 1.8
April  1 => 2.1
July 1 => 2.3
Oct 1 => 2.4
Jan 1 => 2.8
April 1 = 2.9
Etc.

(All values are in mg/Dl, or milligrams per deciliter.)

Although it would be easy to plot these data on a graph with standard Y-axis
values that were uniformly incremental, the preferred way to plot the data
is with the "accelerating" Y-axis values that I have described. When you
actually see the data plotted out, you realize the benefit of doing it this
way. In the early stages of chronic renal insufficiency, the subtle changes
of a few tenths of a point are more accurate and significant, whereas in the
later stages, known as ESRF (end-stage renal failure), subtle changes in
creatinine on the order of 1/10 point are relatively meaningless for a few
different reasons. At these higher values, the labs can't measure that
accurately and, once you reach a value 3 or so, you better get on the list
for renal transplant anyway.

When the data is plotted in the way I described the trend line is much
steeper than it would be with a uniformly incremented Y-axis, thus
demonstrating the progression of the disease more graphically.

So, it's not the data that is complex, it's just the scale of the Y-axis.

I hope this clarifies it. Thanks again.

"Bernard Liengme" <bliengme@stfx.TRUENORTH.ca> wrote in message
news:%23ul7I9p7DHA.488@TK2MSFTNGP12.phx.gbl...
> Hello Gene,
> If you can plot it manually we expect to be able to do it in Excel. But
you
> are asking a lot of this group - you have not told us what to plot. Are
you
> thinking of the Michaelis Menten equation? Or is it some other function of
> [S] that needs to be worked out?
>
> --
> Bernard Liengme
> www.stfx.ca/people/bliengme
> remove CAPS in e-mail address
>
> "Gene" <gene.cooney@cox.net> wrote in message
> news:u0kZCTn7DHA.1504@TK2MSFTNGP12.phx.gbl...
> > I am trying to create what is referred to in the medical literature as a
> > "reciprocal creatine curve." The data is rather simple -- just serum
> > creatinine values (Y-axis) over time (X-axis), but the Y-axis scale is
> quite
> > unusual. The scale is not linear and it's not logarithmic. It's a scale
in
> > which the values appear to constantly accelerate. Thus, the distance
> between
> > 1 and 2 is greater than the distance between 2 and  3, the distance
> between
> > 2 and 3 is greater than the distance between 3 and 4, etc. Toward the
very
> > top of the Y-axis the incremental distance between values becomes
> > infinitesimally small.
> >
> > Is this scale possible to recreate in Excel? Any help is sincerely
> > appreciated.
> >
> >
>
>

```
 0
2/9/2004 1:10:46 AM
```Bernard:

I was able to find an image of the "reciprocal graph" on the following
Website:

http://www.wfubmc.edu/intmed/nephrology/Graph.htm

Thanks again.

"Bernard Liengme" <bliengme@stfx.TRUENORTH.ca> wrote in message
news:%23ul7I9p7DHA.488@TK2MSFTNGP12.phx.gbl...
> Hello Gene,
> If you can plot it manually we expect to be able to do it in Excel. But
you
> are asking a lot of this group - you have not told us what to plot. Are
you
> thinking of the Michaelis Menten equation? Or is it some other function of
> [S] that needs to be worked out?
>
> --
> Bernard Liengme
> www.stfx.ca/people/bliengme
> remove CAPS in e-mail address
>
> "Gene" <gene.cooney@cox.net> wrote in message
> news:u0kZCTn7DHA.1504@TK2MSFTNGP12.phx.gbl...
> > I am trying to create what is referred to in the medical literature as a
> > "reciprocal creatine curve." The data is rather simple -- just serum
> > creatinine values (Y-axis) over time (X-axis), but the Y-axis scale is
> quite
> > unusual. The scale is not linear and it's not logarithmic. It's a scale
in
> > which the values appear to constantly accelerate. Thus, the distance
> between
> > 1 and 2 is greater than the distance between 2 and  3, the distance
> between
> > 2 and 3 is greater than the distance between 3 and 4, etc. Toward the
very
> > top of the Y-axis the incremental distance between values becomes
> > infinitesimally small.
> >
> > Is this scale possible to recreate in Excel? Any help is sincerely
> > appreciated.
> >
> >
>
>

```
 0
2/9/2004 12:01:28 PM
```The easiest way to do what you want -- assuming I understand the
problem correctly -- is the following:

Plot the data and configure the y-axis scale with 'Log Scale' checked
as well as 'Values in reverse order'

Optionally, break up the data into chunks that make sense to you.  Plot
each chunk on a separate graph using the customization above.

--
Regards,

Tushar Mehta, MS MVP -- Excel
www.tushar-mehta.com
Excel, PowerPoint, and VBA add-ins, tutorials
Custom MS Office productivity solutions

In article <uqXs2Xw7DHA.696@tk2msftngp13.phx.gbl>, gene.cooney@cox.net
says...
> Bernard:
>
> I was able to find an image of the "reciprocal graph" on the following
> Website:
>
> http://www.wfubmc.edu/intmed/nephrology/Graph.htm
>
> Thanks again.
>
> "Bernard Liengme" <bliengme@stfx.TRUENORTH.ca> wrote in message
> news:%23ul7I9p7DHA.488@TK2MSFTNGP12.phx.gbl...
> > Hello Gene,
> > If you can plot it manually we expect to be able to do it in Excel. But
> you
> > are asking a lot of this group - you have not told us what to plot. Are
> you
> > thinking of the Michaelis Menten equation? Or is it some other function of
> > [S] that needs to be worked out?
> >
> > --
> > Bernard Liengme
> > www.stfx.ca/people/bliengme
> > remove CAPS in e-mail address
> >
> > "Gene" <gene.cooney@cox.net> wrote in message
> > news:u0kZCTn7DHA.1504@TK2MSFTNGP12.phx.gbl...
> > > I am trying to create what is referred to in the medical literature as a
> > > "reciprocal creatine curve." The data is rather simple -- just serum
> > > creatinine values (Y-axis) over time (X-axis), but the Y-axis scale is
> > quite
> > > unusual. The scale is not linear and it's not logarithmic. It's a scale
> in
> > > which the values appear to constantly accelerate. Thus, the distance
> > between
> > > 1 and 2 is greater than the distance between 2 and  3, the distance
> > between
> > > 2 and 3 is greater than the distance between 3 and 4, etc. Toward the
> very
> > > top of the Y-axis the incremental distance between values becomes
> > > infinitesimally small.
> > >
> > > Is this scale possible to recreate in Excel? Any help is sincerely
> > > appreciated.
> > >
> > >
> >
> >
>
>
>
```
 0
2/9/2004 2:09:28 PM
```Gene -

I have an example on my web site showing a reciprocal temperature scale:

http://peltiertech.com/Excel/Charts/RecipAxisChart.html

It's a variation on the Arbitrary Axis technique:

http://peltiertech.com/Excel/Charts/ArbitraryAxis.html

- Jon
-------
Jon Peltier, Microsoft Excel MVP
Peltier Technical Services
http://PeltierTech.com/Excel/Charts/
_______

Gene wrote:

> I am trying to create what is referred to in the medical literature as a
> "reciprocal creatine curve." The data is rather simple -- just serum
> creatinine values (Y-axis) over time (X-axis), but the Y-axis scale is quite
> unusual. The scale is not linear and it's not logarithmic. It's a scale in
> which the values appear to constantly accelerate. Thus, the distance between
> 1 and 2 is greater than the distance between 2 and  3, the distance between
> 2 and 3 is greater than the distance between 3 and 4, etc. Toward the very
> top of the Y-axis the incremental distance between values becomes
> infinitesimally small.
>
> Is this scale possible to recreate in Excel? Any help is sincerely
> appreciated.
>
>

```
 0
jonxlmvpNO (4558)
2/9/2004 4:11:22 PM
```Thanks. That gives me something to work with. Much appreciated!

"Jon Peltier" <jonxlmvpNO@SPAMpeltiertech.com> wrote in message
news:%23%23JaSdy7DHA.2392@TK2MSFTNGP11.phx.gbl...
> Gene -
>
> I have an example on my web site showing a reciprocal temperature scale:
>
>    http://peltiertech.com/Excel/Charts/RecipAxisChart.html
>
> It's a variation on the Arbitrary Axis technique:
>
>    http://peltiertech.com/Excel/Charts/ArbitraryAxis.html
>
> - Jon
> -------
> Jon Peltier, Microsoft Excel MVP
> Peltier Technical Services
> http://PeltierTech.com/Excel/Charts/
> _______
>
> Gene wrote:
>
> > I am trying to create what is referred to in the medical literature as a
> > "reciprocal creatine curve." The data is rather simple -- just serum
> > creatinine values (Y-axis) over time (X-axis), but the Y-axis scale is
quite
> > unusual. The scale is not linear and it's not logarithmic. It's a scale
in
> > which the values appear to constantly accelerate. Thus, the distance
between
> > 1 and 2 is greater than the distance between 2 and  3, the distance
between
> > 2 and 3 is greater than the distance between 3 and 4, etc. Toward the
very
> > top of the Y-axis the incremental distance between values becomes
> > infinitesimally small.
> >
> > Is this scale possible to recreate in Excel? Any help is sincerely
> > appreciated.
> >
> >
>

```
 0
2/10/2004 1:18:34 AM

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