The phrase "poor predictor" means something that is not good at guessing or estimating future outcomes accurately.
Sentences with «poor predictor»
Another troubling factor is that past price movements are very poor predictors of the future. (investopedia.com)
While value - added data alone is a relatively poor predictor of teacher performance, the value - added estimate used next year is especially poor because it is not at all valid. (tnedreport.com)
The amount of stress you encounter is a surprisingly poor predictor of whether it will leave you worse (or better) off. (inc.com)