Re: [R] Kruskal's MDS results

Thank you for clearing this out. Jari Oksanen wrote: Dieter Vanderelst ua.ac.be> writes: The point is that the manual for the isoMDS function says it's stress output is in "percent". Does this mean, the stress reported by isoMDS is just the stress value in MASS (which ranges from 0 to 1)

Re: [R] Kruskal's MDS results

Dieter Vanderelst ua.ac.be> writes: > > The point is that the manual for the isoMDS function says it's stress output is in "percent". Does this mean, > the stress reported by isoMDS is just the stress value in MASS (which ranges from 0 to 1) value multiplied by > 100? I've haven't been able to

Re: [R] Kruskal's MDS results

Dieter Vanderelst ua.ac.be> writes: > > A few people suggested taking a look at Ripley's book MASS. I know the formula listed there. > > The point is that the manual for the isoMDS function says it's stress output is in "percent". Does this mean, > the stress reported by isoMDS is just the stre

Re: [R] Kruskal's MDS results

A few people suggested taking a look at Ripley's book MASS. I know the formula listed there. The point is that the manual for the isoMDS function says it's stress output is in "percent". Does this mean, the stress reported by isoMDS is just the stress value in MASS (which ranges from 0 to 1) v

Re: [R] Kruskal's MDS results

Hi Dieter, > I understand that the stress is a measure of how good the > algorithm managed to represent the ordinal distances between > items. And I also see why it's dependent on the number of > dimensions. > I was hoping someone could tell me exactly what the formula > for the percentual stres

Re: [R] Kruskal's MDS results

You can look in MASS 4 for this formula on page 308 . Go to the source and ask the horse he'll give you an answer that you endorse. On Thu, Apr 16, 2009 at 8:13 AM, Bob Green wrote: > > Dieter, > > You could always try the "Classification, clustering, and phylogeny > estimation"  list which ofte

Re: [R] Kruskal's MDS results

Dieter, You could always try the "Classification, clustering, and phylogeny estimation" list which often includes posts regarding MDS: http://lists.sunysb.edu/index.cgi?A0=CLASS-L regards Bob __ R-help@r-project.org mailing list https://stat.eth

Re: [R] Kruskal's MDS results

Hi Michael, Thanks for the reply. I understand that the stress is a measure of how good the algorithm managed to represent the ordinal distances between items. And I also see why it's dependent on the number of dimensions. I was hoping someone could tell me exactly what the formula for the pe

Re: [R] Kruskal's MDS results

Hi Dieter, I'll take a shot at this. As I understand it, the stress is telling you how the ordination distances compare with original dissimilarities that you calculated. It is a measure how well your ordination has done in representing the relationship of your sites. Note that the stress will

[R] Kruskal's MDS results

Dear List, I'm trying to interpret the results of the Kruskal's Non-metric Multidimensional Scaling algorithm (isoMDS, MASS package). The 'goodness of fit' is reported as "The final stress achieved (in percent)". What does this mean exactly? I've tried to google for an answer but I've not com