0.680336
0.462857
90
50
350
132.287566
0.680336
0.462857
90
50
350
132.287566
The Correlation Coefficient Calculator computes Pearson's r and R squared from summary statistics. It measures the strength and direction of the linear relationship between two variables in biological research.
r = (nΣxy - ΣxΣy) / √[(nΣx² - (Σx)²)(nΣy² - (Σy)²)]
Values range from -1 (perfect negative) through 0 (no correlation) to +1 (perfect positive). R² indicates the proportion of variance explained.
Inputs
Results
r = 0.9 indicates a strong positive linear relationship.
Inputs
Results
r = 0.12 shows very weak positive correlation.
No. Correlation measures association, not causation. Establishing causation requires controlled experiments.
|r| of 0.9-1.0 is very strong, 0.7-0.9 strong, 0.5-0.7 moderate, 0.3-0.5 weak, below 0.3 negligible.
Both variables are continuous, the relationship is linear, data are approximately normally distributed, and no significant outliers.
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