FITLINES sub-command for GGRAPH: An easier way to add a regression lines to scatter-plots
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FITLINES sub-command for GGRAPH: An easier way to add a regression lines to scatter-plots
 
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Apologies if someone has already posted on this. My searches for FITLINE
were finding only references to the old IGRAPH command (which is now deprecated, IIRC). I just noticed in the FM for v25 that GGRAPH now includes a FITLINES sub-command which can be used to add an overall regression line or regression lines for sub-groups. FITLINES is much easier (I think) than the old method, which required adding an ELEMENT line to the GPL section. Here's an example to illustrate both approaches. * Example from the v25 FM entry for GGRAPH: * https://www.ibm.com/support/knowledgecenter/en/SSLVMB_25.0.0/statistics_reference_project_ddita/spss/base/syn_ggraph_examples.html. * Simple Scatterplot with Fit Line. * Change path on the next line as needed. GET FILE "C:\SPSSdata\Employee data.sav". * First, the old method: Notice the final ELEMENT line. GGRAPH /GRAPHDATASET NAME="graphdataset" VARIABLES=salbegin salary /GRAPHSPEC SOURCE=INLINE. BEGIN GPL SOURCE: s=userSource(id("graphdataset")) DATA: salbegin=col(source(s), name("salbegin")) DATA: salary=col(source(s), name("salary")) GUIDE: axis(dim(1), label("Beginning Salary")) GUIDE: axis(dim(2), label("Current Salary")) ELEMENT: point(position(salbegin*salary)) ELEMENT: line(position(smooth.linear(salbegin*salary))) END GPL. * Now the new method, via FITLINES. * Notice that the ELEMENT line used above has been removed. GGRAPH /GRAPHDATASET NAME="graphdataset" VARIABLES=salbegin salary /GRAPHSPEC SOURCE=INLINE /FITLINES TOTAL=YES SUBGROUP=NO. BEGIN GPL SOURCE: s=userSource(id("graphdataset")) DATA: salbegin=col(source(s), name("salbegin")) DATA: salary=col(source(s), name("salary")) GUIDE: axis(dim(1), label("Beginning Salary")) GUIDE: axis(dim(2), label("Current Salary")) ELEMENT: point(position(salbegin*salary)) END GPL. Using v25 for Windows, I get essentially the same scatter-plot both ways. (The FITLINES method adds the value of Rsq to the chart.) Finally, here's another example that adds gender as a third variable, and adds separate regression lines for males & females. * Add gender as a grouping variable, and plot separate regression * lines for males & females. * Chart Builder. GGRAPH /GRAPHDATASET NAME="graphdataset" VARIABLES=salbegin salary gender MISSING=LISTWISE REPORTMISSING=NO /GRAPHSPEC SOURCE=INLINE /FITLINES TOTAL=NO SUBGROUP=YES. BEGIN GPL SOURCE: s=userSource(id("graphdataset")) DATA: salbegin=col(source(s), name("salbegin")) DATA: salary=col(source(s), name("salary")) DATA: gender=col(source(s), name("gender"), unit.category()) GUIDE: axis(dim(1), label("Beginning Salary")) GUIDE: axis(dim(2), label("Current Salary")) GUIDE: legend(aesthetic(aesthetic.color.interior), label("Gender")) GUIDE: text.title(label("Grouped Scatter of Current Salary by Beginning Salary by Gender")) SCALE: cat(aesthetic(aesthetic.color.interior), include("f", "m")) ELEMENT: point(position(salbegin*salary), color.interior(gender)) END GPL. I think this is a very nice addition to GGRAPH, and I suggest that the example in the FM be updated to use FITLINES. Cheers, Bruce ----- -- Bruce Weaver [hidden email] http://sites.google.com/a/lakeheadu.ca/bweaver/ "When all else fails, RTFM." NOTE: My Hotmail account is not monitored regularly. To send me an e-mail, please use the address shown above. -- Sent from: http://spssx-discussion.1045642.n5.nabble.com/ ===================== To manage your subscription to SPSSX-L, send a message to [hidden email] (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD
--
Bruce Weaver bweaver@lakeheadu.ca http://sites.google.com/a/lakeheadu.ca/bweaver/ "When all else fails, RTFM." PLEASE NOTE THE FOLLOWING: 1. My Hotmail account is not monitored regularly. To send me an e-mail, please use the address shown above. 2. The SPSSX Discussion forum on Nabble is no longer linked to the SPSSX-L listserv administered by UGA (https://listserv.uga.edu/). |
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The Chart Builder (Graphs > Chart Builder) in version 25 of Statistics has a number of new features that reduce the need to resort to GPL or manual chart editing. On Fri, Mar 16, 2018 at 3:36 PM, Bruce Weaver <[hidden email]> wrote: Apologies if someone has already posted on this. My searches for FITLINE |
Re: FITLINES sub-command for GGRAPH: An easier way to add a regression lines to scatter-plots
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What are they trying to do, make Andy's website obsolete? ;-)
https://andrewpwheeler.wordpress.com/category/spss/ Jon Peck wrote > The Chart Builder (Graphs > Chart Builder) in version 25 of Statistics has > a number of new features that reduce the need to resort to GPL or manual > chart editing. > > On Fri, Mar 16, 2018 at 3:36 PM, Bruce Weaver < > bruce.weaver@ > > > wrote: > >> Apologies if someone has already posted on this. My searches for FITLINE >> were finding only references to the old IGRAPH command (which is now >> deprecated, IIRC). >> >> I just noticed in the FM for v25 that GGRAPH now includes a FITLINES >> sub-command which can be used to add an overall regression line or >> regression lines for sub-groups. FITLINES is much easier (I think) than >> the >> old method, which required adding an ELEMENT line to the GPL section. >> Here's an example to illustrate both approaches. >> >> * Example from the v25 FM entry for GGRAPH: >> * >> https://www.ibm.com/support/knowledgecenter/en/SSLVMB_25. >> 0.0/statistics_reference_project_ddita/spss/base/syn_ggraph_examples.html. >> * Simple Scatterplot with Fit Line. >> >> * Change path on the next line as needed. >> GET FILE "C:\SPSSdata\Employee data.sav". >> >> * First, the old method: Notice the final ELEMENT line. >> GGRAPH >> /GRAPHDATASET NAME="graphdataset" VARIABLES=salbegin salary >> /GRAPHSPEC SOURCE=INLINE. >> BEGIN GPL >> SOURCE: s=userSource(id("graphdataset")) >> DATA: salbegin=col(source(s), name("salbegin")) >> DATA: salary=col(source(s), name("salary")) >> GUIDE: axis(dim(1), label("Beginning Salary")) >> GUIDE: axis(dim(2), label("Current Salary")) >> ELEMENT: point(position(salbegin*salary)) >> ELEMENT: line(position(smooth.linear(salbegin*salary))) >> END GPL. >> >> * Now the new method, via FITLINES. >> * Notice that the ELEMENT line used above has been removed. >> >> GGRAPH >> /GRAPHDATASET NAME="graphdataset" VARIABLES=salbegin salary >> /GRAPHSPEC SOURCE=INLINE >> /FITLINES TOTAL=YES SUBGROUP=NO. >> BEGIN GPL >> SOURCE: s=userSource(id("graphdataset")) >> DATA: salbegin=col(source(s), name("salbegin")) >> DATA: salary=col(source(s), name("salary")) >> GUIDE: axis(dim(1), label("Beginning Salary")) >> GUIDE: axis(dim(2), label("Current Salary")) >> ELEMENT: point(position(salbegin*salary)) >> END GPL. >> >> Using v25 for Windows, I get essentially the same scatter-plot both ways. >> (The FITLINES method adds the value of Rsq to the chart.) >> >> Finally, here's another example that adds gender as a third variable, and >> adds separate regression lines for males & females. >> >> * Add gender as a grouping variable, and plot separate regression >> * lines for males & females. >> >> * Chart Builder. >> GGRAPH >> /GRAPHDATASET NAME="graphdataset" VARIABLES=salbegin salary gender >> MISSING=LISTWISE >> REPORTMISSING=NO >> /GRAPHSPEC SOURCE=INLINE >> /FITLINES TOTAL=NO SUBGROUP=YES. >> BEGIN GPL >> SOURCE: s=userSource(id("graphdataset")) >> DATA: salbegin=col(source(s), name("salbegin")) >> DATA: salary=col(source(s), name("salary")) >> DATA: gender=col(source(s), name("gender"), unit.category()) >> GUIDE: axis(dim(1), label("Beginning Salary")) >> GUIDE: axis(dim(2), label("Current Salary")) >> GUIDE: legend(aesthetic(aesthetic.color.interior), label("Gender")) >> GUIDE: text.title(label("Grouped Scatter of Current Salary by Beginning >> Salary by Gender")) >> SCALE: cat(aesthetic(aesthetic.color.interior), include("f", "m")) >> ELEMENT: point(position(salbegin*salary), color.interior(gender)) >> END GPL. >> >> >> I think this is a very nice addition to GGRAPH, and I suggest that the >> example in the FM be updated to use FITLINES. >> >> Cheers, >> Bruce >> >> >> >> >> ----- >> -- >> Bruce Weaver >> > bweaver@ >> http://sites.google.com/a/lakeheadu.ca/bweaver/ >> >> "When all else fails, RTFM." >> >> NOTE: My Hotmail account is not monitored regularly. >> To send me an e-mail, please use the address shown above. >> >> -- >> Sent from: http://spssx-discussion.1045642.n5.nabble.com/ >> >> ===================== >> To manage your subscription to SPSSX-L, send a message to >> > LISTSERV@.UGA > (not to SPSSX-L), with no body text except the >> command. To leave the list, send the command >> SIGNOFF SPSSX-L >> For a list of commands to manage subscriptions, send the command >> INFO REFCARD >> > > > > -- > Jon K Peck > jkpeck@ > > ===================== > To manage your subscription to SPSSX-L, send a message to > LISTSERV@.UGA > (not to SPSSX-L), with no body text except the > command. To leave the list, send the command > SIGNOFF SPSSX-L > For a list of commands to manage subscriptions, send the command > INFO REFCARD ----- -- Bruce Weaver [hidden email] http://sites.google.com/a/lakeheadu.ca/bweaver/ "When all else fails, RTFM." NOTE: My Hotmail account is not monitored regularly. To send me an e-mail, please use the address shown above. -- Sent from: http://spssx-discussion.1045642.n5.nabble.com/ ===================== To manage your subscription to SPSSX-L, send a message to [hidden email] (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD
--
Bruce Weaver bweaver@lakeheadu.ca http://sites.google.com/a/lakeheadu.ca/bweaver/ "When all else fails, RTFM." PLEASE NOTE THE FOLLOWING: 1. My Hotmail account is not monitored regularly. To send me an e-mail, please use the address shown above. 2. The SPSSX Discussion forum on Nabble is no longer linked to the SPSSX-L listserv administered by UGA (https://listserv.uga.edu/). |
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No complaints from me if my stuff is obsolete due to better options. I will
have to play around with some of those new options to see how they interact with chart templates (GRIDLINES and FRAME in particular -- I don't foresee using COLORCYCLE, but I see how it could be handy). Also could see how DATAFILTER is useful, but I currently use TEMPORARY and then SELECT IF just before the GGRAPH call to accomplish the same thing. In my V25 it also says there is a new subcommand OVERRIDE under GRAPHSPEC, but I don't see it documented anywhere in the help, https://www.ibm.com/support/knowledgecenter/en/SSLVMB_25.0.0/statistics_reference_project_ddita/spss/base/syn_ggraph.html. (That is a nice update too, sending the help to an online website, so can be updated, is that new in V25?) ----- Andy W [hidden email] http://andrewpwheeler.wordpress.com/ -- Sent from: http://spssx-discussion.1045642.n5.nabble.com/ ===================== To manage your subscription to SPSSX-L, send a message to [hidden email] (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD |
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