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Correlation
It measures the existing relationship between two variables. Its value is between –1 and 1. If it is negative, the relationship between the variables is inverse, that is to say, as the values of one increase, those of the other decrease. If it is positive, the association is direct, that is to say, the values of one variable increase with the other. A value of zero indicates no relationship. When variables are continuous and have a linear relationship, Pearson's linear correlation coefficient is an appropriate measure of association. When the variables are not continuous, other correlation coefficients are used
Crude rate
A crude rate is the proportion that represents the number of events in the population in which they occur. This population has not been treated to make it comparable with other populations, which does not allow the comparison of this rate with other rates.
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