Bug in _parsewt?

[Mauricio Caceres]

The following gives error

. clear

. set obs 10
number of observations (_N) was 0, now 10

. gen x = _n

. gen w = _n

. xtile z = (x) if 1 [fw = w]
unknown function ()
r(133);

I think it is due to a bug in _parsewt, which xtile uses to parse weights before parsing the rest of the syntax. For example:

. _parsewt "fweight" z = (x) if 1 [fw = w]

. disp `"`s(newcmd)'"'
z = (x)if 1

I'm on Stata 15.1; from "viewsource xtile.ado" I have version 3.1.9 17nov2017; from "viewsource _parsewt.ado" I have version 2.0.5 11feb2015.

[Rafal Raciborski (StataCorp)]

Mauricio found a bug in xtile. We will have it fixed in a future update; in the meantime the workaround is to rearrange the syntax as follows.

xtile z = log(x) [fw = w] if 1

[Rafal Raciborski (StataCorp)]

This bug has been fixed in yesterday's update.