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Your LimeSurvey version: 6.4.0+
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================= created a question (SQ2) asking respondents for their age. Using an equation, I added logic to create an age group called SQ2group as a hidden question. It records well in the response table.However, in statistics, I get the message "**How old are you? Too many labels, can't generate chart**" and it won't create a chart for SQ2. In this case, I want to see an age group chart based on SQ2group, but it can't find the statistics information for the hidden question created through the equation. 

You will not get statistics for equation type questions. Use that question to set values in a hidden list-radio question.

Thank you. I tried applying the method of automatically linking the answers from the previous question to the radio list question using equations. The graphs generated in statistics look good.