add preprint, add relative links to README

Author: joe-sfx

docs/asymmetric/README.md

@@ -2,7 +2,9 @@ This directory contains some empirical results of constructing t-digests with as
 which may be of particular interest for distributions with substantial skew. Suitable asymmetric scale functions
 can be obtained by gluing the familiar k<sub>1</sub>, k<sub>2</sub>, k<sub>3</sub> to their tangent lines at some point p in (0, 1).
 A theoretical justification for this construction (namely, the proofs that the modified scale functions produce
-mergeable data structures that can operate online), together with these results, will be submitted for publication shortly.
+mergeable data structures that can operate online), together with these results, is contained in a preprint
+"Asymmetric scale functions for t-digests." The preprint is available in this repository [here](../proofs/gluing-construction.pdf)
+and at https://arxiv.org/abs/2005.09599, and has been submitted for publication.
 
 The main goal here is to compare the usual scale functions with their asymmetric counterparts (using the point p=1/2 as a gluing location),
 both in terms of accuracy and memory consumption (via number of centroids). A quadratic scale function is considered as well.
@@ -15,20 +17,19 @@ The data and summarizing plots can be produced in two steps.
 
 ### Generate data
 
-In `TDigestTests.java`, run `writeUniformResultsWithCompression` with the `ALVTreeDigest` implementation, i.e., run
+In [TDigestTests](../../core/src/test/java/com/tdunning/math/stats/TDigestTest.java), run `writeUniformResultsWithCompression` with the `ALVTreeDigest` implementation, i.e., run
 `AVLTreeDigestTest.writeUniformResultsWithCompression`.
 
-In `MergingDigestTest.java`, run `writeAsymmetricScaleFunctionResults`.
+In [MergingDigestTest](../../core/src/test/java/com/tdunning/math/stats/MergingDigestTest.java), run `writeAsymmetricScaleFunctionResults`.
 
-These will write data files to subdirectories of the `data` directory of `asymmetric`.
-The data so generated is already present.
+These will write data files.
 
 
 ### Generate plots
 
-Now run the script `generate_plots.py` located in this directory.
+Now run the script [generate_plots.py](./generate_plots.py).
 
 This script expects to be present the results of running the tests as above.
-It will write plots (as PNG files) to subdirectories of the `plots` directory.
-The figures so generated are already present.
-
+It will write plots (as PNG files).
+The figures so generated are already present in this repository, see [here](../asymmetric/plots/merging/t_digest_figs_K_0q.png)
+and [here](../asymmetric/plots/tree/t_digest_figs_K_0q.png) for example.