Dear Anupam Tyagi,
You didn't include your data, so it's not possible to see exactly what
happened, but I think that you misunderstand the object that loess()
returns. It returns a "loess" object with several components, including
the original data in x and y. So if pass the object to lines(), you'll
simply connect the points, and if x isn't sorted, the points won't be in
order. Try, e.g.,
plot(speed ~ dist, data=cars)
m <- loess(speed ~ dist, data=cars)
names(m)
lines(m)
You'd do better to use loess.smooth(), which is intended for adding a
loess regression to a scatterplot; for example,
plot(speed ~ dist, data=cars)
with(cars, lines(loess.smooth(dist, speed)))
Other points: You don't have to load the stats package which is
available by default when you start R. It's best to avoid attach(), the
use of which can cause confusion.
I hope this helps,
John
--
* preferred email: john.david....@proton.me
John Fox, Professor Emeritus
McMaster University
Hamilton, Ontario, Canada
web: https://www.john-fox.ca/
On 2023-03-23 10:18 a.m., Anupam Tyagi wrote:
For some reason the following code is not plotting as I want it to. I want
to plot a "loess" line plotted over a scatter plot. I get a jumble, with
lines connecting all the points. I had a similar problem with "lowess". I
solved that by dropping "NA" rows from the data columns. Please help.
library(stats)
attach(gini_pci_wdi_narm)
plot(ny_gnp_pcap_pp_kd, si_pov_gini)
lines(loess(si_pov_gini ~ ny_gnp_pcap_pp_kd, gini_pci_wdi_narm))
detach(gini_pci_wdi_narm)
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