How To Calculate Product Moment Correlation Coefficient - Come Diventare Stilista Di Moda

The product moment correlation coefficient allows you to work out the linear dependence of two variables (referred to as x and y). An example in economics may be that you are the owner of a restaurant. For every 10th customer you record the time he stayed in your restaurant (x, in minutes) and the amount spent (y, in dollars). Is it generally true that the long stayers are also the bigger spenders? This would be a positive correlation. Or is it actually the other way around, e.g. the richer the client the less time he takes for his lunch? This would be a negative correlation. In order to shed some light on this mystery you can calculate the PMCC.