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This is anovice question, but I have been trying to understand it the whole day. I have got three text types and three scores representing readability indices for each text type. How can I compute a correlation to check whether there is a significant difference between the scores depending on the text? I have tried to do but didn't succeed, I got messages of this sort: one variable is constant (I cannot replicate it here anymore).

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In order to attain a significant difference you need variability. In this example, if i am correct, you just have one instance of the index for each text type. I would interpret that as simply one is more readable than the other based on the single observations for each. You can’t say much more.

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  • $\begingroup$ Thank you. I thought I was missing something. $\endgroup$ – Margarida Jul 9 at 18:13

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