Response did no show
I have a matrix question in my survey. I made it force response since the day I developed the questions (see picture below).
I conducted few pilot studies in past few days. I am sure all participants answer this question. However, when I clicked on the "data and analysis" icon and read through the responses I have received, I found that there are quit a lot of participants' responses did not show the answer for this question! (see picture below)
Can anyone in the community tell me why this happened?