Version: 2008 Operating System: Mac OS X 10.5 (Leopard) Processor: Intel I found a serious bug/mistake in Excel Trendline addition: <br> Given a linear correlation, plotted as XY (Scatter) spanned over several magnitudes. Adding a linear trendline works fine. However, changing the linear scale to logarithmic will not change the trendline to logarithmic, consequently showing the correlation in a completely wrong way. <br> I checked it with previous Win version of Excel (2003) that works fine and changes the trendline according to scale. However, Excel 2007 (Win) has the same problem as 2008 Mac Excel. <br> I was a very annoying problem I encountered with since I started the work with logarithmic scales and thus no good trendline fitting was possible. <br> I also sent a request message to Microsoft for revision. <br><br>Anyone could confirm my observation or has a suggestion?

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12/16/2009 10:33:25 AM

In article <59baf262.-1@webcrossing.JaKIaxP2ac0>, AVeg@officeformac.com wrote: > Version: 2008 > Operating System: Mac OS X 10.5 (Leopard) > Processor: Intel > > I found a serious bug/mistake in Excel Trendline addition: <br> > Given a linear correlation, plotted as XY (Scatter) spanned over several > magnitudes. Adding a linear trendline works fine. However, changing the > linear scale to logarithmic will not change the trendline to logarithmic, > consequently showing the correlation in a completely wrong way. <br> > I checked it with previous Win version of Excel (2003) that works fine and > changes the trendline according to scale. However, Excel 2007 (Win) has the > same problem as 2008 Mac Excel. <br> > I was a very annoying problem I encountered with since I started the work > with logarithmic scales and thus no good trendline fitting was possible. <br> > I also sent a request message to Microsoft for revision. <br><br>Anyone could > confirm my observation or has a suggestion? Yeah - stop using Trendlines. Entirely. If you must use excel for advanced analysis like this, learn about LINEST and LOGEST. -- Team EM to the rescue! http://www.team-em.com

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12/16/2009 10:27:37 PM

Hi Carl, <br><br>Thanks for the reply and suggestion. I tested LINEST that works OK but the curve drawn along the logarithmic scale is not continuous but broken. <br> So, my final conclusion is NOT to use Excel anymore (as I do not have Office 2004) and stick to NUMBERS instead, which does the work excellently and more fun to work with. <br><br>Akos

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12/27/2009 5:08:01 PM

Hi Aveg, <br><br>I've been trying to reproduce the issue you reported. The steps I tried are: <br><br>1. Create a scatter chart <br> 2. Add a linear trendline <br> 3. Change the Y-axis to "logarithmic scale" <br> 4. The trendline remains linear <br><br>I followed the same steps on MacXL2004 and WinXL 2003 - both have the same result: the trendline remains linear. I was wondering whether my steps are correct. <br><br>Thanks, <br> XinXin Liu <br> Macintosh Business Unit, Microsoft <br><br>This posting is provided "AS IS" with no warranties, and confers no rights. <br><br>> I found a serious bug/mistake in Excel Trendline addition: <br> > Given a linear correlation, plotted as XY (Scatter) spanned over several magnitudes. Adding a linear trendline works fine. However, changing the linear scale to logarithmic will not change the trendline to logarithmic, consequently showing the correlation in a completely wrong way. <br> > I checked it with previous Win version of Excel (2003) that works fine and changes the trendline according to scale. However, Excel 2007 (Win) has the same problem as 2008 Mac Excel. <br> > I was a very annoying problem I encountered with since I started the work with logarithmic scales and thus no good trendline fitting was possible. <br> > I also sent a request message to Microsoft for revision. <br> > <br> > Anyone could confirm my observation or has a suggestion?

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12/29/2009 4:22:53 AM

Hi! <br><br>I am afraid I was not clear in my first post. I meant the X axes to be changed first of all. <br><br>I tested Excel 2008 Mac and 2007 Win with negative results, i.e., it does not change the linear trendlines into logarithmic when the X axes is changed to logarithmic. <br><br>I also tested Excel 2003 Win with positive results, i.e., it does change the trendlines to logarithmic. However, no other Office versions I could test. <br><br>Hopefully, this can help you. <br><br>Yet again, I stick to Numbers since then, which works fine. <br><br>Akos

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1/8/2010 2:05:55 PM

In article <59baf262.3@webcrossing.JaKIaxP2ac0>, AVeg@officeformac.com wrote: > Hi! <br><br>I am afraid I was not clear in my first post. I meant the X axes > to be changed first of all. <br><br>I tested Excel 2008 Mac and 2007 Win with > negative results, i.e., it does not change the linear trendlines into > logarithmic when the X axes is changed to logarithmic. <br><br>I also tested > Excel 2003 Win with positive results, i.e., it does change the trendlines to > logarithmic. However, no other Office versions I could test. > <br><br>Hopefully, this can help you. <br><br>Yet again, I stick to Numbers > since then, which works fine. <br><br>Akos As I said, do NOT use Trendlines to get curve fits. There are more problems than just the one you are having. Read up on LINEST and LOGEST, and use these to get your fit coefficients in a worksheet. -- Team EM to the rescue! http://www.team-em.com

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1/8/2010 5:58:35 PM

Hi AVeg, with the additional information, I can repro this bug. We are investigating it. <br><br>Thanks, <br> XinXin Liu <br> Macintosh Business Unit, Microsoft <br><br>This posting is provided "AS IS" with no warranties, and confers no rights. <br><br>> Hi! <br> > <br> > I am afraid I was not clear in my first post. I meant the X axes to be changed first of all. <br> > <br> > I tested Excel 2008 Mac and 2007 Win with negative results, i.e., it does not change the linear trendlines into logarithmic when the X axes is changed to logarithmic. <br> > <br> > I also tested Excel 2003 Win with positive results, i.e., it does change the trendlines to logarithmic. However, no other Office versions I could test. <br> > <br> > Hopefully, this can help you. <br> > <br> > Yet again, I stick to Numbers since then, which works fine. <br> > <br> > Akos

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1/11/2010 10:07:05 AM

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Heres my problem: I am outputting XML from a dataset and using XSLT to format the output as HTML and the Response.ContentType = "application/vnd.ms-excel" directive to load the output as an Excel file running within the context of the browser. This works fine and the result is a nicely formatted Excel report. I was wondering if there was any way to also send additional formatting information like page margins and scaling. I've seen some examples of this using XMLSS but am not sure how to construct these types of commands in XSLT. Thanks for any help! Hello! > I am outputti...

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I have a bar chart with gradient fills. The bar chart has a max value set so some bars are cut off. This chart is displayed in a picture link. In this picture the bars continue "through the roof" of the chart. Has anyone else encountered this? I can solve it by having solid fills, is there another way? My advice is to use solid fills. Not only is it simpler, but sometimes gradients can distract the reader or imply certain things about the data. - Jon ------- Jon Peltier, Microsoft Excel MVP Tutorials and Custom Solutions http://PeltierTech.com _______ "Marcus" <M...

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Using Excel 2007, when I set the page scaling to restrict the width of the document to one page only Excel enters a page break after EACH ROW and EACH COLUMN so a spreadsheet with 5 rows and fice colums ends up being 25 pages? When i go to page break view and try to reset ALL page breaks it will only reset the page breaks if the scaling is reset back to automatic. This has just started to happen - anyone have any ideas? It happens with all excel shhets, not just one so i think that there is some issue witrh the program. I am about to try and repair excel and possibly reinstall. Any bett...

Is there a way to have a logarithmic graph ignore the cells that contain a 0 value or no value in the graphed range?? Thanks ahead of time for the help. Log(0) is infinite. What do you propose instead? Logarithmic graphs do ignore cells that contain no value. Do you perhaps mean that it is not ignoring cells that contain zero length strings? Try using =IF(<condition>,<formula>,#N/A) instead of =IF(<condition>,<formula>,"") or =IF(<condition>,<formula>,0) Jerry John Babcock wrote: > Is there a way to have a logarithmic graph...

Version: 2008 Operating System: Mac OS X 10.6 (Snow Leopard) Processor: Intel Hi, <br> I have a big problem with a chart I have created a simple chart with this values: <br><br>X Y <br> 1.13700	 0.39213 <br> 1.46200	 0.23851 <br> 1.63300	 0.13124 <br> 1.87500	 0.04913 <br><br>and I add a trendline , when I extract the formula the scope value and the interceptor value are wrong, If I try to calculate the same value with excel formule (SCOPE - INTERCEPTOR) I obtain a corre...

Does anyone know how to create a line chart that displays both the X AN Y axes in logarithmic format -- bobpanke ----------------------------------------------------------------------- bobpankey's Profile: http://www.excelforum.com/member.php?action=getinfo&userid=1516 View this thread: http://www.excelforum.com/showthread.php?threadid=26799 Bob, Most charts are category charts. On the x axis are equally spaced categories (Apples, Oranges, etc.), and their associated values are plotted on the Y axis, optionally logarithmically. It sounds as though you need to plot points, with b...

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Hi I have plotted a chart using a logarithmic scale - is it true to say that on a logarithmic scale the distance between the points are proportional - whereas on a linear scale the distance between the figures are relative?? Thanks In a word: NO -- Bernard V Liengme www.stfx.ca/people/bliengme remove caps from email <miriamlight@gmail.com> wrote in message news:1157445149.864746.180940@p79g2000cwp.googlegroups.com... > Hi > > I have plotted a chart using a logarithmic scale - is it true to say > that on a logarithmic scale > the distance between the points are prop...

You need to chart the data in an XY Scatter chart (not a Line chart). You can choose an XY Scatter chart subtype that connects the markers with lines. Then double click each axis, and on the Scale tab, check the Logarithmic Scale checkbox. - Jon ------- Jon Peltier, Microsoft Excel MVP Peltier Technical Services Tutorials and Custom Solutions http://PeltierTech.com/ _______ Thanks a lot. I'll try this. "transco" wrote: > ...