Methodology
1.Collecting the results of national test (O-NET) and achievement in each subject of students in grade 12, Princess Chulabhorn's College Lopburi total of eight group learning. Since the 2554-2557 academic year
2.Create a distribution diagram (Scatter Graph) of a national test score (O-NET) and the achievement of each of the subjects came. To find out the trend of relations that are related to each other in the form of a linear equation, quadratic equation or exponential equation .
3.Calculate the coefficient of determination (R2) to determine which independent variables were associated with more or less dependent variables are expressed as a percent.
4.Find a, b, and create a parameter prediction equations based on the format of the equations from the diagram to determine the distribution of prediction model options.
When the data is a linear equation.
1) yi = axi + nb
2) xiyi = ax2i + bxi
The regression equation is = a + b
When the data is a quardratic equation
1) yi = ax2 i + bxi + nc
2) xiyi = ax3i + b x2i + cxi
3) x2iyi = ax4i + b x3i + c x2i
The regression equation is = a 2 + b + c
When the data is a Exponential equation
1) log yi = nlog a + (log b)xi
2) xi log yi = (log a) xi + (log b)x2i
The regression equation is =
5.Calculate statistically MSE and P-value.
6.Analysis of the statistical value calculation: R2 MSE and P-value to be used as a tool to determine the suitability of the prediction equations.