https://www.rdocumentation.org/packages/stats/versions/3.6.2/topics/lm.fit

University of Michigan - Ann Arbor

``` R
### start with assigning lm.fit to the model:
lm.fit = lm(XVAL~YVAL, data = datavar)
#1.  lm.fit provides “basic” information *such as* Coefficients
lm.fit
```
Below is an example of the type of output information you can get calling lm.fit (from Pg. 111 of Introduction to Statistical Learning with Applications in R).


lm.fit: Output Basic Statistical Information in R 

``` R
#summary(lm.fit) provides “detailed” information on the model including:
#1.) R^2 statistic
#2.) F-statistic
#3.) p-values
#4.) standard errors for coefficients for the model
summary(lm.fit)
```
Below is an example of the type of output information you can get calling **summary(lm.fit)**

(from Pg. 111 of Introduction to Statistical Learning with Applications in R).


summary(lm.fit): Output Detailed Statistical Information in R

- predict() returns y-hat (estimate) based on your training model. 
- This method produces the confidence and prediction intervals for the prediction of YVAL given a value of the XVAL. In other words, for each training set, we have corresponding x and y values. 
- Now we have a new data set and we are passing a vector with one column from that new data and we want to predict the prediction/confidence intervals for that new data value based on the training data model.
```R
predict(lm.fit, data.frame(XVAL=(c(new_data_row_value1, new_data_row_value2), interval = “”)
#Example: 
predict(lm.fit, data.frame(XVAL=(c(5, 10,15)), interval = “prediction”)
	#Above, data.frame is included as an optional data frame that looks for variables to predict. Without it, fitted values are used.
	#interval = “confidence” , “none”, “prediction” are all options
        ```

predict(): Predict New Data from the (Simple) Linear Model in R

```R 
#confint() provides information on confidence intervals for the coefficient estimates
#This can be used with both simple and multiple linear regression

confint(lm.fit)
```
Below is an example of the output information you can get by calling confint(lm.fit):

(from Pg. 111 of Introduction to Statistical Learning with Applications in R).

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