Year 12s: what will be the first way you research your future options? >>

which anova?

Hi

I must only use either a one-way ANOVA, a two-way ANOVA or a two-factor ANOVA in this exercise.

I'm considering using a one-way ANOVA, but I'm still not quite sure...

(edited 8 years ago)

Reply 1

Gregorius

Original post by SikoSiko

Hi

The question is: "Is the average salary different for persons with different categories of education?"

I must only use either a one-way ANOVA, a two-way ANOVA or a two-factor ANOVA in this exercise.
I will attach the data that I have available, maybe you could look at it and tell me which ANOVA is most fitted?
My data is a sample of full-time occupied persons. The sample is considered representative of the working population.

I'm considering using a one-way ANOVA, but I'm still not quite sure...

The obvious question is "why must you use one-way ANOVA, a two-way ANOVA or a two-factor ANOVA in this exercise"? It's pretty obvious that salary will be a function of at least sex age and experience, so the obvious analysis to do is a linear regression adjusting for these possible confouncers. Whether you use salary or log(salary) as outcome depends on the distribution of residuals.

Reply 2

SikoSiko

So I should use linear regression instead of ANOVA?

Reply 3

Gregorius

Original post by SikoSiko

So I should use linear regression instead of ANOVA?

How many subjects do you have in your dataset?

Reply 4

SikoSiko

Original post by Gregorius

How many subjects do you have in your dataset?

Okay, so what I have understood of the assignment so far is that to answer this question ("Is the average salary different for persons with different categories of education?") I should use the Salary variable and the Schooling-cat (as seen in the attachment) because in the next question sounds as follows: "Are the conclusions from the previous question changed if gender is included in the analysis?"
That's why I thought to first start out with ANOVA....

Reply 5

chazwomaq

Original post by SikoSiko

What's the difference between "two-way" and "two-factor" ANOVA?

Original post by SikoSiko

So I should use linear regression instead of ANOVA?

Linear regression and ANOVA are the same - they're just different ways of expressing a general linear model.

Given the question, a one-way ANOVA using schooling-cat would answer it. It doesn't ask you to control for anything else (as far as you've said).

Reply 6

SikoSiko

Original post by chazwomaq

What's the difference between "two-way" and "two-factor" ANOVA?

Linear regression and ANOVA are the same - they're just different ways of expressing a general linear model.

Given the question, a one-way ANOVA using schooling-cat would answer it. It doesn't ask you to control for anything else (as far as you've said).

All right, thank you! So in the next question where I include gender, it is then sufficient with a two-way ANOVA?

Reply 7

Gregorius

Original post by SikoSiko

Okay, so what I have understood of the assignment so far is that to answer this question ("Is the average salary different for persons with different categories of education?" :wink:

I should use the Salary variable and the Schooling-cat (as seen in the attachment) because in the next question sounds as follows: "Are the conclusions from the previous question changed if gender is included in the analysis?"
That's why I thought to first start out with ANOVA....

Ah right, I hadn't twigged that you were answering questions on an assignment. Yes, one-way ANOVA for the first is fine and two-way for the second.

However, with data like this, the proper way to do the analysis is via regression using continuous variables as continuous.

Reply 8

chazwomaq

Original post by SikoSiko

All right, thank you! So in the next question where I include gender, it is then sufficient with a two-way ANOVA?

Yes.

In general, please give as much information as you can - "this is an assignment", "this is part 1 of a 3 part question", then give all parts etc. etc.

Reply 9

SikoSiko

Original post by chazwomaq

Yes.

In general, please give as much information as you can - "this is an assignment", "this is part 1 of a 3 part question", then give all parts etc. etc.