Hi Joffm,

I establish a simple choice question and respondent could give me an answer, for example, 20%. And then, I want to get a result 0 or 1 in the next equation question and the result is 1 with a possibility of 20% and 0 with 80%. I don't know how to achieve this.

Best,
Qiang

Did you try any of my proposals I gave four days ago?

And please, do not expect anything from me, if you if you are not able to explain what exactly you want to achieve?
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I have this single question
 

and I want the following result
If the respondent selects 20% there is a new variable (proz20) set to 1, otherwise to 0
If the respondent selects 50% there is a new variable (proz50) set to 1, otherwise to 0

And exactly this I showed in my proposals
Otherwise you have to use some equations, like
eq20: {if(Q1=="20",1,0)}
eq50: {if(Q1=="50",1,0)}
...

Or do you want to calculate the result and talk about probability?

and the result is 1 with a possibility of 20% and 0 with 80%.

You can do this:
Create a random number (0-100)
Now you can say {if(Q1=="20",if(randnum le 20,1,0),if(Q1=="50",if(randnum le 50,1,0),if(Q1=="80",if(randnum le 80,1,0),0)))}
Now
if the respondent selects "20" he will get a "1" with a probability of 20% and a "0" with a probability of 80%
if the respondent selects "50" he will get a "1" with a probability of 50% and a "0" with a probability of 50%
...

Do you want to achieve this?

Sorry, till now nobody seems to know.

Joffm
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Hi Joffm,

The last section you give is what I want. Getting a random 0 or 1 with a different possibility. Thanks for your help.

Best,
Qiang