Datapoint Singlish/Position of indefinite article in the noun phrase

Indefinite articles have been observed to be optional in usage, but the conditions for this are unclear.

Values

Indefinite article is preposed

Example 21-8:
You mean you brought your I.C. to a temp agency?
You
2sg
mean
mean
you
2sg
brought
bring.pst
your
2sg.poss
I.C.
identity.card
to
prep
a
art
temp
temporary
agency?
agency
Do you mean you brought your identity card to an agency for temporary jobs?

Source: Wee and Ansaldo 2004: 60

Example 21-16:
Yes, I was calling up for temp job.
Yes,
yes
I
1sg
was
be.sg.pst
call-ing
call-prog
up
up
for
for
temp
temporary
job.
job
Yes, I was phoning for a temporary job.

Source: Wee and Ansaldo 2004: 60

Confidence:
Very certain