Pearson’s correlation was carried out to find out the correlation among total arsenic, other metals concentrations in soil and rice grain and chemical properties of the soils by SPSS. Pearson's correlation coefficient when applied to a sample is commonly represented by the letter r and may be referred to as the sample correlation coefficient or the sample Pearson correlation coefficient. We can obtain a formula for r by substituting estimates of the covariances and variances based on a sample into the formula above. So if we have one dataset {x1,...xn} containing n values and another dataset {y1,...yn} containing n values then that formula for r is: