Our dynamic residual calculator is designed to find residual values for each observation on the basis of a linear regression model by putting the values of the independent (X variable) and dependent (Y variable). The residual values are defined to know the error in our estimation compared to the real values in the marketplace.
“The residual is the difference between actual and predicted value by the linear regression model (y-ŷ) of a given point”.
Residual is evaluated after running the regression model. The residual value calculator evaluates the residual for all observations in a linear regression model.
Residual = Observed Value - Predicted Value
Residual value is the statistical approach also known as the estimated worth after the asset has been fully undervalued. So the residuals calculator is utilized for getting the accuracy in the estimated results.
Suppose the set of variables that are available for the residual observation in a simple linear regression model.
Dependent Variables = 7, 4, 12, 9, 10, 14
Independent Variables = 3, 5, 8, 11, 19, 4
To answer a problem use the residual calculator statistics or put the variables by hand in the formula:
The data set values for the dependent and independent variables are:
Obs. | X | Y |
1 | 3 | 7 |
2 | 5 | 4 |
3 | 8 | 12 |
4 | 11 | 9 |
5 | 19 | 10 |
6 | 4 | 14 |
Now, construct the estimated regression coefficient using the values of the predicted and response variables:
Obs. | X | Y | Xᵢ² | Yᵢ² | Xᵢ · Yᵢ |
1 | 3 | 7 | 9 | 49 | 21 |
2 | 5 | 4 | 25 | 16 | 20 |
3 | 8 | 12 | 64 | 144 | 96 |
4 | 11 | 9 | 121 | 81 | 99 |
5 | 19 | 10 | 361 | 100 | 190 |
6 | 4 | 14 | 16 | 196 | 56 |
Sum = | 50 | 56 | 596 | 586 | 482 |
The sum of the square generated from the above table are:
$$ SS_{XX} = \sum^n_{i-1}X_i^2 - \dfrac{1}{n} \left(\sum^n_{i-1}X_i \right)^2 $$
$$ = 596 - \dfrac{1}{6} (50)^2 $$
$$ = 179.33 $$
$$ SS_{YY} = \sum^n_{i-1}Y_i^2 - \dfrac{1}{n} \left(\sum^n_{i-1}Y_i \right)^2 $$
$$ = 586 - \dfrac{1}{6} (56)^2 $$
$$ = 63.333 $$
$$ SS_{XY} = \sum^n_{i-1}X_iY_i - \dfrac{1}{n} \left(\sum^n_{i-1}X_i \right) \left(\sum^n_{i-1}Y_i \right) $$
$$ = 482 - \dfrac{1}{6} (50) (56) $$
$$ = 15.333 $$
The slope of the line and y-intercept are calculated by the following formulas:
$$ \hat{\beta}_1 = \dfrac{SS_{XY}}{SS_{XX}} $$
$$ = \dfrac{15.333}{179.33} $$
$$ = \dfrac{15.333}{179.33} $$
$$ = 0.085502 $$
$$ \hat{\beta}_0 = \bar{Y} - \hat{\beta}_1 \times \bar{X} $$
$$ = 9.3333 - 0.085502 \times 8.3333 $$
$$ = 8.6208 $$
Hence, The regression equation is:
$$ \hat{Y} = 8.6208 + 0.085502X $$
After finding the regression equation, we can gather the predicted values by inserting the independent variable in the regression equation that is also taken into account by the online statistics residual calculator:
$$ \hat{Y} = 8.6208 + 0.085502X $$
Obs. | X | Y | Predicted Values ŷ | Residuals(y - ŷ) |
1 | 3 | 7 | 8.6208 + 0.085502 x 3 = 8.8773 | 7 - 8.8773 = -1.8773 |
2 | 5 | 4 | 8.6208 + 0.085502 x 5 = 9.0483 | 4 - 9.0483 = -5.0483 |
3 | 8 | 12 | 8.6208 + 0.085502 x 8 = 9.3048 | 12 - 9.3048 = 2.6952 |
4 | 11 | 9 | 8.6208 + 0.085502 x 11 = 9.5613 | 9 - 9.5613 = -0.56134 |
5 | 19 | 10 | 8.6208 + 0.085502 x 19 = 10.245 | 10 - 10.245 = -0.24535 |
6 | 4 | 14 | 8.6208 + 0.085502 x 4 = 8.9628 | 14 - 8.9628 = 5.0372 |
Residual plot maker can enhance the understanding by sketching the graph which is as follows:
This residual plot calculator is designed to find the residuals for each observation in a simple linear regression model by taking into account the below values:
Input:
Output:
There are the following types that reflect the difference between predicted and observed values:
This fun residuals calculator is an estimation tool designed to help you evaluate the unlimited income potential.
Suppose you want to predict the future stock prices by using the following model:
Stock Price = 2.1 × GDP growth + 18
If the expected GDP growth of the current year is 8%, then the stock price of Company Alpha is:
2.1 × 8 + 18 = $34.8
Wikipedia: Introduction to residuals and least-squares regression, Calculating residual example, Calculating and interpreting residuals.
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