agop (version 0.2-2)

index_rp: The r_p-index

Description

Given a sequence of \(n\) non-negative numbers \(x=(x_1,\dots,x_n)\), where \(x_i \ge x_j\) for \(i \le j\), the \(r_p\)-index for \(p=\infty\) equals to $$r_p(x)=\max_{i=1,\dots,n} \{ \min\{i,x_i\} \}$$ if \(n \ge 1\), or \(r_\infty(x)=0\) otherwise. That is, it is equivalent to a particular OWMax operator, see owmax.

For the definition of the \(r_p\)-index for \(p < \infty\) we refer to (Gagolewski, Grzegorzewski, 2009).

Usage

index_rp(x, p = Inf)
index.rp(x, p = Inf) # same as index_rp(x, p), deprecated alias

Arguments

x

a non-negative numeric vector

p

index order, \(p \in [1,\infty]\); defaults \(\infty\) (Inf).

Value

a single numeric value

Details

Note that if \(x_1,\dots,x_n\) are integers, then $$r_\infty(x)=H(x),$$ where \(H\) is the \(h\)-index (Hirsch, 2005) and $$r_1(x)=W(x),$$ where \(W\) is the \(w\)-index (Woeginger, 2008), see index_h and index_w.

If non-increasingly sorted vector is given, the function is O(n).

For historical reasons, this function is also available via its alias, index.rp [but its usage is deprecated].

References

Gagolewski M., Grzegorzewski P., A geometric approach to the construction of scientific impact indices, Scientometrics 81(3), 2009, pp. 617-634.

Hirsch J.E., An index to quantify individual's scientific research output, Proceedings of the National Academy of Sciences 102(46), 2005, pp. 16569-16572.

Woeginger G.J., An axiomatic characterization of the Hirsch-index, Mathematical Social Sciences 56(2), 2008, pp. 224-232.

See Also

Other impact_functions: index_g, index_h, index_lp, index_maxprod, index_w, pord_weakdom

Examples

# NOT RUN {
x <- runif(100, 0, 100);
index.rp(x);            # the r_oo-index
floor(index.rp(x));     # the h-index
index.rp(floor(x), 1);  # the w-index
# }