How often is a Metafilter user's first post an obit post?

# A Makefile using the Metafilter infodump to see how often a user's
# first post is an obituary post.
FIRSTPOSTID=70000
default: obitpostids postdata_mefi.txt firstobitposts firstposts
	@echo "Number of obit posts: $$(wc -l obitpostids |cut -f1 -d' ')"
	@echo "Total number of posts: $$(awk -F"\t" '$$1 >= $(FIRSTPOSTID) {print $$1}' postdata_mefi.txt |wc -l |cut -f1)"
	@echo "Number of first posts that are obit posts: $$(wc -l firstobitposts |cut -f1 -d' ')"
	@echo "Total number of first posts: $$(wc -l firstposts |cut -f1 -d' ')"
firstobitposts: firstposts obitpostids
	join firstposts obitpostids >$@
firstposts: postdata_mefi.txt
	tr -d '\r' <$< |sed 1,2d |awk -F"\t" '{if ($$2 in a) next; a[$$2] = $$1; if ($$1 >= $(FIRSTPOSTID)) print}' |sort -k1b,1 >$@
obitpostids: tagdata_mefi.txt
	tr -d '\r' <$< |sed 1,2d |awk -F"\t" '$$4 ~ /^[oO]bit/ && $$2 >= $(FIRSTPOSTID) {print $$2}' |sort -u -k1b,1>$@
clean:
	rm firstobitposts firstposts obitpostids
%.txt: %.txt.zip
	unzip $<
%.txt.zip:
	wget http://stuff.metafilter.com/infodump/$@