Y axis, need varying units

You just have to figure out how to tell Excel what to graph.

- Jon
-------
Jon Peltier, Microsoft Excel MVP
Peltier Technical Services
Tutorials and Custom Solutions
http://PeltierTech.com/
_______

NTE wrote:
Thank you Jon. I followed your example. Plus added in your tricks with
using the error bars as gridlines, etc. I now have a graph that approximates
what I was asked to produce. I will never again doubt the ability of excel
to produce a visually correct complicated graph.
NTE

"Jon Peltier" wrote:


I should have more clearly noted that the data for the dummy label series, in the
first three columns, is independent of the data for the actual data points. In my
example I had as many labels as data points, and the ranges therefore looked
connected. You don't want labels at 0.040776226, 0.081807752, etc.

Your label data should be (change the zeros in the second column to whatever the X
axis minimum is):

label Xlabel Ylabel
0.1% 0 -3.090244718
1% 0 -2.326341928
5% 0 -1.644853
20% 0 -0.841621386
50% 0 0
80% 0 0.841621386
95% 0 1.644853
99% 0 2.326341928
99.9% 0 3.090244718

Construct your dummy axis with these points and labels.

For your regular values, if the numbers that seem so much like percentages are
percentages, you turn them into Y values with the same NORMSINV function. If I put
the X values and the Cum% values into columns E and F, with headers in E1:F1 and
values starting in row 2, cell G2 should have this formula:

=NORMSINV(F2)

so your regular data should look like:

X Cum% Y
2.56937391 4.077622647 -1.741746019
2.58546073 8.180775241 -1.393013918
2.589949601 12.29105172 -1.160560714
2.657055853 16.50782651 -0.973798251
2.741151599 20.8580621 -0.811355676
2.854306042 25.38787495 -0.662332695
2.862131379 29.9301067 -0.526410986
2.935507266 34.58878672 -0.396446467
3.192009593 39.65453856 -0.262299409
3.250175948 44.812601 -0.130397666
3.266936911 49.99726325 -6.82121E-05
3.268343914 55.18415844 0.130314675
3.339451441 60.483902 0.26589305
3.354684554 65.80782066 0.407223979
3.454234896 71.28972673 0.561868774
3.465234095 76.78908865 0.731918135
3.532754379 82.39560594 0.93054723
3.572755465 88.06560537 1.178273124
3.582631439 93.75127807 1.534226612
3.937417581 100 #NUM!

The last value gives an error, because for a normal distribution, you never really
get to 100%. So ignore it. Judging from the first column, you should probably change
the X axis minimum to 2.5 and maximum to 4, and change the column of Xlabel values
from zero to 2.5.

- Jon
-------
Jon Peltier, Microsoft Excel MVP
Peltier Technical Services
Tutorials and Custom Solutions
http://PeltierTech.com/
_______

NTE wrote:

Jon,

I went back and re-read the
http://peltiertech.com/Excel/Charts/...lityChart.html information.

I then tried to format my data as suggested in the example. So , it looked
like this (my apologies for the wrapping):

label Xlabel Ylabel Xdata Rank Yrank
0.040776226 0 -1.741748078 2.56937391 1 -1.937930375
0.081807752 0 -1.393014526 2.58546073 2 -1.412187915
0.122910517 0 -1.160559893 2.589949601 3 -1.118958596
0.165078265 0 -0.973798618 2.657055853 4 -0.899434781
0.208580621 0 -0.811355814 2.741151599 5 -0.71649726
0.25387875 0 -0.662333303 2.854306042 6 -0.554922843
0.299301067 0 -0.52641172 2.862131379 7 -0.406724367
0.345887867 0 -0.396446536 2.935507266 8 -0.266994277
0.396545386 0 -0.262299357 3.192009593 9 -0.132312766
0.44812601 0 -0.130397314 3.250175948 10 5.47142E-10
0.499972633 0 -6.86002E-05 3.266936911 11 0.132312766
0.551841584 0 0.130315392 3.268343914 12 0.266994277
0.60483902 0 0.265892704 3.339451441 13 0.406724367
0.658078207 0 0.407223963 3.354684554 14 0.554922843
0.712897267 0 0.561868613 3.454234896 15 0.71649726
0.767890886 0 0.7319184 3.465234095 16 0.899434781
0.823956059 0 0.930547032 3.532754379 17 1.118958596
0.880656054 0 1.178273031 3.572755465 18 1.412187915
0.937512781 0 1.534224617 3.582631439 19 1.937930375
3.937417581 20
And yes, I did get a nice looking graph. However, as you noted, the
major"ticks" on the dummy axis are not evenly spaced. Plus, I wanted only 9
y axis values, specifically
0.1
1
5
20
50
80
95
99
99.9

but the way this worked out I got 19 y axis values, and of course they were
not set to the 9 values I wanted.
Thank you for help, and the probablilty chart method will come in helpful
for other applications.
NTE

"Jon Peltier" wrote:



You meant to say Yes. Your numbers are between 0 and 100. I assume this is 0 and
100%, in fact, you say they are cumulative percentages. The Y axis numbers you've
indicated are commonly used in probability plots, but they are not, strictly
speaking, evenly spaced.

Barb suggested this web page:

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

I suggest you go to this page, and see what a cumulative probability plot looks
like, then decide whether in fact, the way that it shows a cumulative percentage of
a factor plotted on the X axis is what you need.

- Jon
-------
Jon Peltier, Microsoft Excel MVP
Peltier Technical Services
Tutorials and Custom Solutions
http://PeltierTech.com/
_______

NTE wrote:



No. My numbers are all above 1. Basically what I've been asked to do is
visually "squash" the datapoints.

It is kind of like a log-scale, in that we want to show more information in
less space, but it is not a probability plot. The x variable is a log of a
workplace protection factor for certain equipment. The y variable is the
cumulative percent.

NTE

"Barb Reinhardt" wrote:




Are you trying to make a probability plot?

"NTE" wrote in message
...



I'm using Excel 2002.

I have data that looks like this:
X Y
2.56937391 4.077622647
2.58546073 8.180775241
2.589949601 12.29105172
2.657055853 16.50782651
2.741151599 20.8580621
2.854306042 25.38787495
2.862131379 29.9301067
2.935507266 34.58878672
3.192009593 39.65453856
3.250175948 44.812601
3.266936911 49.99726325
3.268343914 55.18415844
3.339451441 60.483902
3.354684554 65.80782066
3.454234896 71.28972673
3.465234095 76.78908865
3.532754379 82.39560594
3.572755465 88.06560537
3.582631439 93.75127807
3.937417581 100

I need to produce a scatter plot in excel. Simple to do in general.
However, the requestor has asked me to have the major y-axis values be

these



(evenly spaced on the y axis):

0.1
1
5
20
50
80
95
99
99.9

I was able, using information found at http://PeltierTech.com/ (thank you
Jon) to make a dummy series that would portray the axis as I needed it.
However, the data is still plotted on the "real" axis and obviously does

not



line up with the "fake" y-axis values. Because there is a different

amount



of "space" between the major ticks, the distance between points will need

to



vary.

Any suggestions appreciated. I am going to try a SAS solution as well,

but



the end-users prefer to be able to do it in excel.