I have the following hypothesis:

Novice drivers perceive road environments as more difficult when there are more pedestrians.

I have the following data:

- The category each driver falls in to (1. Novices, 2. Experienced, 3. Advanced)

- Number of pedestrians identified in 5 separate sections for 26 drivers

- Ranked difficulty for each section (obtained from a questionnaire from each driver)

Example:

Section; No. Pedestrains; Ranked Pedestrians; Ranked Difficulty; Driver

1 2 1 3 1

2 15 3 2 1

3 3 2 1 1

4

5 and so on..

1 5 1 1 2

2 12 3 2 2

3 7 2 3 2

4

5

and so on...

http://postimage.org/image/xccl7l01j/

I have ranked the number of pedestrians and compared it to the ranked difficulty in SPSS using Spearmans ranked correlation. I did this separately for each driver group. The correlation co-efficients are:

Novice 0.57

Experienced 0.56

Advanced 0.77

Is this the right test or is there a better test to use to analyse the data? Can anyone point me in the right direction? Ideally I would like a statistical test that compares the three driver groups.

My advanced driver data set is also much smaller than the others, will this cause problems?

Thanks in advance.

Novice drivers perceive road environments as more difficult when there are more pedestrians.

I have the following data:

- The category each driver falls in to (1. Novices, 2. Experienced, 3. Advanced)

- Number of pedestrians identified in 5 separate sections for 26 drivers

- Ranked difficulty for each section (obtained from a questionnaire from each driver)

Example:

Section; No. Pedestrains; Ranked Pedestrians; Ranked Difficulty; Driver

1 2 1 3 1

2 15 3 2 1

3 3 2 1 1

4

5 and so on..

1 5 1 1 2

2 12 3 2 2

3 7 2 3 2

4

5

and so on...

I have ranked the number of pedestrians and compared it to the ranked difficulty in SPSS using Spearmans ranked correlation. I did this separately for each driver group. The correlation co-efficients are:

Novice 0.57

Experienced 0.56

Advanced 0.77

Is this the right test or is there a better test to use to analyse the data? Can anyone point me in the right direction? Ideally I would like a statistical test that compares the three driver groups.

My advanced driver data set is also much smaller than the others, will this cause problems?

Thanks in advance.

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