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pro vyhledávání: '"de Leeuw Jan"'
Autor:
de Leeuw, Jan
We define *fDistances*, which generalize Euclidean distances, squared distances, and log distances. The least squares loss function to fit fDistances to dissimilarity data is *fStress*. We give formulas and R/C code to compute partial derivatives of
Externí odkaz:
http://arxiv.org/abs/2407.18314
Autor:
de Leeuw, Jan
Modifications of the smacof algorithm for multidimensional scaling are proposed that provide a convergent majorization algorithm for Kruskal's stress formula two.
Comment: 16 pages, 4 figures, R code
Comment: 16 pages, 4 figures, R code
Externí odkaz:
http://arxiv.org/abs/2407.18313
Autor:
de Leeuw, Jan
The full-dimensional (metric, Euclidean, least squares) multidimensional scaling stress loss function is combined with a quadratic external penalty function term. The trajectory of minimizers of stress for increasing values of the penalty parameter i
Externí odkaz:
http://arxiv.org/abs/2407.16645
Autor:
De Leeuw, Jan
To study convergence of SMACOF we introduce a modification mSMACOF that rotates the configurations from each of the SMACOF iterations to principal components. This modification, called mSMACOF, has the same stress values as SMACOF in each iteration,
Externí odkaz:
http://arxiv.org/abs/2407.12945
Within the domain of e-commerce retail, an important objective is the reduction of parcel loss during the last-mile delivery phase. The ever-increasing availability of data, including product, customer, and order information, has made it possible for
Externí odkaz:
http://arxiv.org/abs/2310.16602
Autor:
Graffelman, Jan, de Leeuw, Jan
Publikováno v:
The American Statistitician, 2023, 77(4) pp. 432--442
The graphical representation of the correlation matrix by means of different multivariate statistical methods is reviewed, a comparison of the different procedures is presented with the use of an example data set, and an improved representation with
Externí odkaz:
http://arxiv.org/abs/2211.13150
Autor:
Kleinjan Jan H, Dietz Viviane, de Leeuw Jan, Spaans Wilbert A, den Boon Jan, Bongers Marlies Y, Roovers Jan-Paul WR, Vaart C Huub, Milani Fred L, Broekhuis Suzan R, Mol Ben, Kluivers Kirsten B, van Leijsen Sanne AL, Brölmann Hans AM, Roos Eveline J, Schaafstra Judith, Heesakkers John PFA, Vierhout Mark E
Publikováno v:
BMC Women's Health, Vol 9, Iss 1, p 22 (2009)
Abstract Background Stress urinary incontinence (SUI) is a common problem. In the Netherlands, yearly 64.000 new patients, of whom 96% are women, consult their general practitioner because of urinary incontinence. Approximately 7500 urodynamic evalua
Externí odkaz:
https://doaj.org/article/45efaba332d84cb1bcfb48a70278b134
Autor:
Bosire, Caroline K., Mtimet, Nadhem, Enahoro, Dolapo, Ogutu, Joseph O., Krol, Maarten S., de Leeuw, Jan, Ndiwa, Nicholas, Hoekstra, Arjen Y.
Publikováno v:
In Heliyon March 2022 8(3)
Autor:
Aynekulu, Ermias, Sileshi, Gudeta W., Rosenstock, Todd S., van Noordwijk, Meine, Tsegaye, Diress, Koala, Jonas, Sawadogo, Louis, Milne, Eleanor, de Leeuw, Jan, Shepherd, Keith
Publikováno v:
In Basic and Applied Ecology November 2021 56:165-175
Autor:
Nkedianye, David K., Ogutu, Joseph O., Said, Mohammed Y., Kifugo, Shem, de Leeuw, Jan, Van Gardingen, Paul, Reid, Robin S.
Publikováno v:
In World Development Perspectives June 2019 14