User (Legacy) Posted November 20, 2006 Report Share Posted November 20, 2006 I did not see 'G Chart' listed at http://www.chartfx.com/Extensions/featuresStatistical.aspx , is it available? if not, will it be added soon? Thanks Dan Reber Link to comment Share on other sites More sharing options...
Software FX Posted November 20, 2006 Report Share Posted November 20, 2006 I am not familiar with this chart type, can you point me to a URL with a definition. I couldn't find it in Wiki either. -- Francisco Padron www.chartfx.com Link to comment Share on other sites More sharing options...
User (Legacy) Posted November 20, 2006 Author Report Share Posted November 20, 2006 Here is a good explanation - http://www1.coe.neu.edu/~benneyan/papers/g_chart_overview/ "Software FX" <noreply@softwarefx.com> wrote in message news:mhghD6NDHHA.2096@webserver3.softwarefx.com... >I am not familiar with this chart type, can you point me to a URL with a >definition. I couldn't find it in Wiki either. > > -- > Francisco Padron > www.chartfx.com > Link to comment Share on other sites More sharing options...
Software FX Posted November 20, 2006 Report Share Posted November 20, 2006 Thank you, I will look into it and possible suggest it for a next version, I believe however, that you can achieve this chart using an p-Chart. All SPC charts allow you to define your own Sigma and Mean values, control limits are drawn at Mean - 3*Sigma and Mean + 3*Sigma. In an X-Chart, by default the Mean is automatically calculated as the "mean of means" while the control limits are calculated using the un-bias sigma. To override this default you can do the following: statistics1.Gallery.Current = Galleries.Gallery.PChart; statistics1.Gallery.PChart.Mean = .5; statistics1.Gallery.PChart.Sigma = .1; So if you calculate both the Mean and Sigma for the G-Chart in your code, you can use this "customized p-chart" as your G-Chart. Let me know if this helps. Note: The same principle applies to all SPC chart, so if your data looks more like the x-Chart or np-Chart, you can use one of those instead of the p-Chart. -- Francisco Padron www.chartfx.com Link to comment Share on other sites More sharing options...
User (Legacy) Posted November 21, 2006 Author Report Share Posted November 21, 2006 Thanks for the suggestion. This request came from one of our clients, I will admit that I don't know too much statistics so I may need some help when then time comes to implement this. Thanks Dan "Software FX" <noreply@softwarefx.com> wrote in message news:4kQb$wPDHHA.3220@webserver3.softwarefx.com... > Thank you, > > I will look into it and possible suggest it for a next version, I believe > however, that you can achieve this chart using an p-Chart. > > All SPC charts allow you to define your own Sigma and Mean values, control > limits are drawn at Mean - 3*Sigma and Mean + 3*Sigma. > > In an X-Chart, by default the Mean is automatically calculated as the > "mean of means" while the control limits are calculated using the un-bias > sigma. > > To override this default you can do the following: > > statistics1.Gallery.Current = Galleries.Gallery.PChart; > > statistics1.Gallery.PChart.Mean = .5; > > statistics1.Gallery.PChart.Sigma = .1; > > So if you calculate both the Mean and Sigma for the G-Chart in your code, > you can use this "customized p-chart" as your G-Chart. > > > Let me know if this helps. > > Note: The same principle applies to all SPC chart, so if your data looks > more like the x-Chart or np-Chart, you can use one of those instead of the > p-Chart. > > -- > Francisco Padron > www.chartfx.com > Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.