envelope function (spatstat) - error "unused arguments" -



envelope function (spatstat) - error "unused arguments" -

i inquire help finding reason why when utilize function envelope, arguments not accepted, defined "unused arguments". info i'm using ppp without marks , create l function graph simulated info , data. here code ppp data:

map2008mlw = ppp(xy2008_bngppp$x, xy2008_bngppp$y, window = iom_polygon_mlwowin)

and then:

l2008 = lest(map2008mlw,correction="ripley") op = par(mar=c(5,5,4,4)) plot(l2008, . -r ~ r, ylab=expression(hat("l")), xlab = "d (m)"); par(op) l2008$iso = l$iso - l$r l2008$theo = l$theo - l$r

desired number of simulations

n = 9999

desired p significance level display

p = 0.05

and @ point envelope function doesnt seem happy:

el2008 = envelope(map2008mlw[w], lest, nsim=n, rank=(p * (n + 1))) error in envelope(map2008mlw[w], lest, nsim = n, rank = (p * (n + 1))) : unused arguments (nsim = n, rank = (p * (n + 1)))

it seems generic error , not sure caused bundle spatstat. please, help me in finding solution this, can't proceed analyses.

thank much,

martina

the argument rank should nrank.

also relationship between significance level , argument nrank not right in example. two-sided test, significance level alpha = 2 * nrank/(nsim+1), nrank= alpha * (nsim+1)/2.

you have chosen significance level of 0.95 assume mean 0.05. nsim=9999 want nrank=0.05 * 10000/2 = 250 test significance level 0.05.

such big number of simulations (9999) unnecessary in kind of application. monte carlo tests valid little values of nsim. in illustration utilize nsim=39 , nrank=1.

see chapter 10 of the spatstat book.

arguments envelope spatstat

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