Dear UseRs:

Recently, I have read an article regarding the association between age and
lymph node metastases.
http://jco.ascopubs.org/content/27/18/2931.long
In statistical analysis, the authors stated "Because a nonlinear
relationship between age and lymph node involvement was expected based on
existing literature, lymph node involvement was also regressed on age using
nonparametric logistic regression based on locally weighted scatterplot
smoothing (lowess)."
<http://jco.ascopubs.org/content/27/18/2931.long#ref-11>
Could someone explain nonparametric logistic regression based on locally
weighted scatterplot smoothing (lowess)?
Or it is nonparametric regression based on locally weighted scatterplot
smoothing (lowess)

Thanks

*Yao Zhu*
*Department of Urology
Fudan University Shanghai Cancer Center
Shanghai, China*

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