#StackBounty: #scales comparing 2 surveys on same question but with 2 different scales

Bounty: 100

I have results from 2 surveys asking the same question. One allows for a single answer, the other allows for up to 2 answers. Is there any way to compare the 2 surveys?

He are the numbers:

Survey A: “why do you do x?” Answer up to 2 options

• option 1a) 78%
• option 2a) 43%
• option 3a) 21%
• option 4a) 17%
• option 5a) 13%
• option 6a) 8%
• option 7a) 7%
• option 8a) 7%
• option 9a) 2%

Survey B: “why do you do x?” (same question as survey A) Answer exactly one option

• option 1b) 60% (is the same answer as 2a)
• option 2b) 38% (is the same answer as 1a)
• option 3b) 2%

(How) can I compare the options 1a) and 2b)? Is this even possible?

Get this bounty!!!

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