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The best thing to do here is really to get labeled data. It will do far more for you than any attempt to solve this problem. Especially in something as life-and-death crucial as COVID, deploying a poor model is unethical. What you’ve suggested is to take an unweighted average and threshold it: $\mathrm{COVID?} = \left[ 4 \geq \sum_{i=1}^6 f_i\right]$, using ...


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There is no minimum. It depends on the theoretical construct that you are measuring, and how it relates to the measured variables. Two examples: I've got two measures that are supposed to measure something associated with intelligence. If they don't correlate highly (0.7? To pick a number out of the air), we've got a problem, and I don't want to sum these. ...


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