Using CORR function with sub-queries

I need to compute the correlation of two datasets, however here is my problem:
The table stores responses to a questionnaire, with these columns:
RESPONSE_ID, QUES_ID, ANS_CD
What my query needs to get is the Correlation of 2 sets of ANS_CD, one with QUES_ID=x and one with QUES_ID=y. What I have looks like this:
SELECT CORR ((SELECT ans_cd
FROM fact_responses
WHERE ques_id=x) ,
(SELECT ans_cd
FROM fact_responses
WHERE ques_id=y)
FROM fact_responses
And i get a 'single row subquery returns more than one row' error. Can someone who has more experience with this help me out? I don't want to create a new table to store the data for this one report

The short and sweet of it is that you are trying to correlate question x against question y. With three questions, you are looking for the correlation as such:
1,1
1,2
1,3
2,1
2,2
2,3
3,1
3,2
3,3
Is that correct?

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