**Phenomena and calculation of formulas.**

To begin, a few words about mathematics and statistics as science subjects. They are an integral part of economics – economics is the science of resource allocation with increasing social needs and, in statistics, a phenomenon in society studied using a coefficient of determination. It consists of a percentage determination of values. It is regarded as one of the measures of quality and its formula is as follows:

R2= SSM / SST =∑t = 1n(y^t-y¯) / 2∑t=1n(yt-y¯)

**The coefficient of determination is R squared and it can also be called that.**

The coefficient of convergence has a completely different formula. R squared is in it and, based on the formula, the differences between x and y are calculated. The equations are very simple, just substitute the numbers given to the formula to determine the unknown.

Example:

Y=2*x+20

X=11

Y=2*11+20

Y=42

**Methods with coefficients.**

Usually, methods are used when solving an unknown and, according to the methods, you can get the right result. Here is the method of least squares – it gives the smallest errors when estimating the result.

Linear regression is nothing more than the representation of the thesis after between variables – and the relationship here is in a linear form.

The important element is the linear function, which is expressed by the formula y = bx +a. The representation of the regression in the form of an analysis and its representation can be done using a graph of the linear function (a graph in which the signs are x and y, where x and y are called the dependent and independent variables).

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