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help > RE: design matrix for correlation analysis.
Jul 9, 2014 05:07 AM | Andrew Zalesky
RE: design matrix for correlation analysis.
Hi Youngmin,
Yes - the contrast of [0 0 0 0 1] will test for a positive association with behavior if you select the t-test. It will test for any association (positive or negative) if you select F-test.
Please be careful with the age*IQ regressor, as this interaction will need to be interpreted carefully. You might want to demean the variables before computing the interaction, or it might be best not to include age*IQ.
Andrew
Originally posted by Youngmin Huh:
Yes - the contrast of [0 0 0 0 1] will test for a positive association with behavior if you select the t-test. It will test for any association (positive or negative) if you select F-test.
Please be careful with the age*IQ regressor, as this interaction will need to be interpreted carefully. You might want to demean the variables before computing the interaction, or it might be best not to include age*IQ.
Andrew
Originally posted by Youngmin Huh:
Hi,
I'm trying correlation analysis using NBS, and I'm not sure if i'm using correct design matrix and contrast.
first column consists of ones (for global mean), and second column age, third IQ, fourth age*IQ, and fifth is behavioral score.
1 8.9 113 1005.7 41
1 8.5 101 858.5 117
1 7.9 99 782.1 66
1 7.3 112 817.6 46
1 7.9 112 884.8 48
1 9.7 88 853.6 83
1 8.8 98 862.4 60
1 5.9 129 761.1 63
1 10.6 101 1070.6 108
1 9 120 1080 54
1 10 105 1050 44
1 9.2 97 892.4 60
1 8.7 105 913.5 48
1 5.5 72 396 59
1 7.6 122 927.2 39
1 5.4 88 475.2 59
And I applied [0,0,0,0,1] for contrast to investigate positive correlation. Is this correct?
Any comment would be appreciated.
Thanks,
YM Huh.
I'm trying correlation analysis using NBS, and I'm not sure if i'm using correct design matrix and contrast.
first column consists of ones (for global mean), and second column age, third IQ, fourth age*IQ, and fifth is behavioral score.
1 8.9 113 1005.7 41
1 8.5 101 858.5 117
1 7.9 99 782.1 66
1 7.3 112 817.6 46
1 7.9 112 884.8 48
1 9.7 88 853.6 83
1 8.8 98 862.4 60
1 5.9 129 761.1 63
1 10.6 101 1070.6 108
1 9 120 1080 54
1 10 105 1050 44
1 9.2 97 892.4 60
1 8.7 105 913.5 48
1 5.5 72 396 59
1 7.6 122 927.2 39
1 5.4 88 475.2 59
And I applied [0,0,0,0,1] for contrast to investigate positive correlation. Is this correct?
Any comment would be appreciated.
Thanks,
YM Huh.
Threaded View
| Title | Author | Date |
|---|---|---|
| Youngmin Huh | Jul 9, 2014 | |
| Andrew Zalesky | Jul 9, 2014 | |
| Juan Pablo Princich | Jun 28, 2015 | |
| Andrew Zalesky | Jun 30, 2015 | |
| Youngmin Huh | Jul 11, 2014 | |