Initial commit

p#	new file:   runwikiq.sh

lib-01-sample-datasets.R

@@ -0,0 +1,57 @@
+# Functions for creating samples of datasets
+# Copyright (C) 2018  Nathan TeBlunthuis
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+sample.by.wiki <- function(dt,outcome,N.per.wiki=30){
+    set.seed(0)
+    sample.params <- dt[,.N,by=wiki.name]
+    sample.params[,group.sd := dt[,.(group.sd=sd(.SD[[outcome]])),by=wiki.name]$group.sd]
+
+    sample.params[,p.in.group := N / nrow(dt)]
+
+    sample.params[,min.N := min(N)]
+    sample.params[,n.from.group := pmin(min.N/(1-group.sd), N)]
+
+    sample.params[,p.sampled := n.from.group/N]
+
+    sample.params[,weight := 1/p.sampled]
+    dt[sample.params,":="(prob=p.sampled,weight=weight),on=.(wiki.name)]
+    sample.idx <- sample(nrow(dt),size=sum(sample.params$n.from.group,na.rm=TRUE),prob=dt$prob)
+
+    return(dt[sample.idx])
+}
+
+sample.newcomers <- function()
+{
+    wikis.to.remove <- newcomers[,.N,by="wiki.name"][N<30]$wiki.name
+    remember(nrow(wikis.to.remove),"n.wikis.insufficient.newcomers")
+    newcomers.presample <- newcomers[!(wiki.name  %in% wikis.to.remove)]
+    newcomers.sample <- sample.by.wiki(newcomers.presample,"survives")
+    return(newcomers.sample)
+}
+
+sample.ns4.edits <- function(){
+    wikis.to.keep <- ns4.reg.edits[,.(.N,N.reverts=sum(reverted)),by=wiki.name][(N>30)&(N.reverts > 30)]
+    ns4.reg.edits.sub <- ns4.reg.edits[wiki.name %in% wikis.to.keep$wiki.name]
+    ns4.reg.edits.sample <- sample.by.wiki(ns4.reg.edits.sub,"reverted")
+    return(ns4.reg.edits.sample)
+}
+
+sample.wiki.data <- function(){
+    ## just choose 100 random wikis
+    wikis.to.keep <- sample(unique(wiki.data$wiki.name),100)
+    wiki.data.sample <- wiki.data[wiki.name %in% wikis.to.keep]
+    return(wiki.data.sample)
+}