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Sturaga86
Obsidian | Level 7

 

About the following Stats question in SAS Big data module 1.The question asks what statistic to test the null hypothesis all regression slopes are 0.The answer that was provided is F test in Anova table 

 

But as per my understanding it should be F test in Regression table.

 

I am confused if i am missing something or it's wrong answer provided by in the material

 

3.03 Multiple Answer Poll Correct Answer

Which statistic(s) is/are used to test the null hypothesis that all regression slopes are zero, against the alternative hypothesis that they are not all zero?

  1. F test in the ANOVA table.

  2. F test in the Regression table.

  3. The Global t-test in the parameter estimates table.

  4. R square

  5. Adjusted R square

Any help would be appreciated!

1 ACCEPTED SOLUTION

Accepted Solutions
Cynthia_sas
SAS Super FREQ

Hi:

  Please go back to the e-learning videos for Lesson 2 and look at the demo video entitled: "Using the GLM Procedure" -- this is the first place where the ANOVA table is shown. When you look at that video, at approximately time stamp 2:50, the narrator starts talking about the ANOVA output from PROC GLM, which shows the F statistic. Here's a clip from that video, with the transcript of the narration on the right side of the video:

PROC_GLM_ANOVA_Table.png

 

  If you look on page 2-29 of the course notes, you'll see a similar description of the ANOVA table:

ANOVA_table_in_course_notes.png

 

So the question in the poll in Chapter 3 is intended to reference back to the Analysis of Variance table for F statistic.

 

If you look at the output produced by PROC REG, on page 3-34 in the course notes, you'll see the PROC REG shows the F statistic in a table entitled "Analysis of Variance", as shown below:

chapter_3_anova_table.png

Note that even though this is the regression procedure, the name of the table created by the procedure is the Analysis of Variance or ANOVA table.

 

  Do not confuse the procedure name with the name of the piece of output created by the procedure. The F statistic is contained within the ANOVA table. That's why the answer is ANOVA table.

 

  I also asked one of the instructors who teaches the Statistics 1 class and he said:

"The overall F-test appears as part of the ANOVA table output in both PROC REG  and PROC GLM. Despite performing a regression, an ANOVA table is still produced containing this statistic."

 

  Hope this helps explain the reason behind the question in the course notes.

 

Cynthia

View solution in original post

1 REPLY 1
Cynthia_sas
SAS Super FREQ

Hi:

  Please go back to the e-learning videos for Lesson 2 and look at the demo video entitled: "Using the GLM Procedure" -- this is the first place where the ANOVA table is shown. When you look at that video, at approximately time stamp 2:50, the narrator starts talking about the ANOVA output from PROC GLM, which shows the F statistic. Here's a clip from that video, with the transcript of the narration on the right side of the video:

PROC_GLM_ANOVA_Table.png

 

  If you look on page 2-29 of the course notes, you'll see a similar description of the ANOVA table:

ANOVA_table_in_course_notes.png

 

So the question in the poll in Chapter 3 is intended to reference back to the Analysis of Variance table for F statistic.

 

If you look at the output produced by PROC REG, on page 3-34 in the course notes, you'll see the PROC REG shows the F statistic in a table entitled "Analysis of Variance", as shown below:

chapter_3_anova_table.png

Note that even though this is the regression procedure, the name of the table created by the procedure is the Analysis of Variance or ANOVA table.

 

  Do not confuse the procedure name with the name of the piece of output created by the procedure. The F statistic is contained within the ANOVA table. That's why the answer is ANOVA table.

 

  I also asked one of the instructors who teaches the Statistics 1 class and he said:

"The overall F-test appears as part of the ANOVA table output in both PROC REG  and PROC GLM. Despite performing a regression, an ANOVA table is still produced containing this statistic."

 

  Hope this helps explain the reason behind the question in the course notes.

 

Cynthia

 

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