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help > RE: Strong connections at high thresholds
May 3, 2018 06:05 AM | Andrew Zalesky
RE: Strong connections at high thresholds
Hi Katerina,
Yes - this is correct. You can use a t-test to assess the group x time interaction. For the contrast, you should place a 1 or -1 in the interaction column and 0s everywhere else. Depending how you have coded your design matrix, a significant result with 1 in the contrast vector means greater connectivity in group 1 at time 2, whereas -1 means greater connectivity in group 2 at time 2.
Andrew
Originally posted by hex_dex:
Yes - this is correct. You can use a t-test to assess the group x time interaction. For the contrast, you should place a 1 or -1 in the interaction column and 0s everywhere else. Depending how you have coded your design matrix, a significant result with 1 in the contrast vector means greater connectivity in group 1 at time 2, whereas -1 means greater connectivity in group 2 at time 2.
Andrew
Originally posted by hex_dex:
Dear Andrew,
thank you very much for your response. I will perform one of the checks described and see how it goes. Until then, may I ask you something else... Can I run a t-test with 1 in the column corresponding to time by group difference and the rest 0s and detect this way if the null hypothesis exists? I do that and I get significant results when I use 1 but no significant ones with -1. Does this mean that the connectivity is higher in the group 1 than group -1?
Thank you very much,
Katerina
thank you very much for your response. I will perform one of the checks described and see how it goes. Until then, may I ask you something else... Can I run a t-test with 1 in the column corresponding to time by group difference and the rest 0s and detect this way if the null hypothesis exists? I do that and I get significant results when I use 1 but no significant ones with -1. Does this mean that the connectivity is higher in the group 1 than group -1?
Thank you very much,
Katerina
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Title | Author | Date |
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hex_dex | Apr 28, 2018 | |
hex_dex | May 3, 2018 | |
Andrew Zalesky | Apr 29, 2018 | |
hex_dex | Apr 30, 2018 | |
Andrew Zalesky | May 3, 2018 | |
hex_dex | Apr 28, 2018 | |
hex_dex | Apr 28, 2018 | |