Contrasts and regressors involving two binary factors, 1 covariate, and 1 nuisance factor

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Yang, Daniel

18 Feb 2014 18 Feb '14

10:08 a.m.

Dear FreeSurfer experts,

I have two binary factors (F1: F1L1 F1L2; F2: F2L1 F2L2), 1 covariate (COV), and 1 nuisance factor (NUI). I want to make sense of some specification of the regressors and contrasts. Because they are not described in http://surfer.nmr.mgh.harvard.edu/fswiki/Fsgdf4G1V, I post my understanding below. Can you let me know if it is correct?

This model using the DODS method will have 12 regressors:

Regressor1: 1's for F1L1 F2L1, 0 otherwise (i.e., offset for Group 1) Regressor2: 1's for F1L1 F2L2, 0 otherwise (i.e, offset for Group 2) Regressor3: 1's for F1L2 F2L1, 0 otherwise (i.e., offset for Group 3) Regressor4: 1's for F1L2 F2L2, 0 otherwise (i.e., offset for Group 4) Regressor5: COV for Group1 subjects, 0 otherwise (i.e., COV slope for Group 1) Regressor6: COV for Group2 subjects, 0 otherwise (i.e., COV slope for Group 2) Regressor7: COV for Group3 subjects, 0 otherwise (i.e., COV slope for Group 3) Regressor8: COV for Group4 subjects, 0 otherwise (i.e., COV slope for Group 4) Regressor9: NUI for Group1 subjects, 0 otherwise (i.e., NUI slope for Group 1) Regressor10: NUI for Group2 subjects, 0 otherwise (i.e., NUI slope for Group 2) Regressor11: NUI for Group3 subjects, 0 otherwise (i.e., NUI slope for Group 3) Regressor12: NUI for Group4 subjects, 0 otherwise (i.e., NUI slope for Group 4)

Description1: Does the correlation between thickness and COV, accounting for F1 and F2, differ from 0? Nuisance factors: NUI Contrast1: [0 0 0 0 0.25 0.25 0.25 0.25 0 0 0 0]

Best, Daniel

-- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: yung-jui.yang@yale.edu

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Douglas N Greve

18 Feb 18 Feb

1:30 p.m.

That looks right to me doug

On 02/18/2014 10:08 AM, Yang, Daniel wrote:

...

Dear FreeSurfer experts,

I have two binary factors (F1: F1L1 F1L2; F2: F2L1 F2L2), 1 covariate (COV), and 1 nuisance factor (NUI). I want to make sense of some specification of the regressors and contrasts. Because they are not described in http://surfer.nmr.mgh.harvard.edu/fswiki/Fsgdf4G1V, I post my understanding below. Can you let me know if it is correct?

This model using the DODS method will have 12 regressors:

Regressor1: 1's for F1L1 F2L1, 0 otherwise (i.e., offset for Group 1) Regressor2: 1's for F1L1 F2L2, 0 otherwise (i.e, offset for Group 2) Regressor3: 1's for F1L2 F2L1, 0 otherwise (i.e., offset for Group 3) Regressor4: 1's for F1L2 F2L2, 0 otherwise (i.e., offset for Group 4) Regressor5: COV for Group1 subjects, 0 otherwise (i.e., COV slope for Group 1) Regressor6: COV for Group2 subjects, 0 otherwise (i.e., COV slope for Group 2) Regressor7: COV for Group3 subjects, 0 otherwise (i.e., COV slope for Group 3) Regressor8: COV for Group4 subjects, 0 otherwise (i.e., COV slope for Group 4) Regressor9: NUI for Group1 subjects, 0 otherwise (i.e., NUI slope for Group 1) Regressor10: NUI for Group2 subjects, 0 otherwise (i.e., NUI slope for Group 2) Regressor11: NUI for Group3 subjects, 0 otherwise (i.e., NUI slope for Group 3) Regressor12: NUI for Group4 subjects, 0 otherwise (i.e., NUI slope for Group 4)

Description1: Does the correlation between thickness and COV, accounting for F1 and F2, differ from 0? Nuisance factors: NUI Contrast1: [0 0 0 0 0.25 0.25 0.25 0.25 0 0 0 0]

Best, Daniel

-- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: _yung-jui.yang@yale.edu_

Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

-- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

Yang, Daniel

1:58 p.m.

Thanks Doug! One follow-up question: since it's [0.25 0.25 0.25 0.25], would the effect be biased toward large sample sizes in one of the groups (versus the other groups)?

Or, does FreeSurfer qdec take care of the unequal cell, in a possible way analogous to using Type III SS in the traditional ANOVA?

Best, Daniel -- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: yung-jui.yang@yale.edu

On 2/18/14 1:30 PM, "Douglas N Greve" <greve@nmr.mgh.harvard.edumailto:greve@nmr.mgh.harvard.edu> wrote:

That looks right to me doug

On 02/18/2014 10:08 AM, Yang, Daniel wrote: Dear FreeSurfer experts,

This model using the DODS method will have 12 regressors:

Description1: Does the correlation between thickness and COV, accounting for F1 and F2, differ from 0? Nuisance factors: NUI Contrast1: [0 0 0 0 0.25 0.25 0.25 0.25 0 0 0 0]

Best, Daniel

-- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: _yung-jui.yang@yale.edu_mailto:_yung-jui.yang@yale.edu_

_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edumailto:Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

-- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edumailto:greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.

Douglas N Greve

2:13 p.m.

It will tend to weight smaller groups by a proportion greater than the number of subjects in the group.

On 02/18/2014 01:58 PM, Yang, Daniel wrote:

...

Thanks Doug! One follow-up question: since it's [0.25 0.25 0.25 0.25], would the effect be biased toward large sample sizes in one of the groups (versus the other groups)?

Or, does FreeSurfer qdec take care of the unequal cell, in a possible way analogous to using Type III SS in the traditional ANOVA?

Best, Daniel -- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: _yung-jui.yang@yale.edu_

On 2/18/14 1:30 PM, "Douglas N Greve" <greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu> wrote:

That looks right to me
doug


On 02/18/2014 10:08 AM, Yang, Daniel wrote:

    Dear FreeSurfer experts,

    I have two binary factors (F1: F1L1 F1L2; F2: F2L1 F2L2), 1
    covariate
    (COV), and 1 nuisance factor (NUI). I want to make sense of some
    specification of the regressors and contrasts.
    Because they are not described
    in http://surfer.nmr.mgh.harvard.edu/fswiki/Fsgdf4G1V, I post my
    understanding below. Can you let me know if it is correct?

    This model using the DODS method will have 12 regressors:

    Regressor1: 1's for F1L1 F2L1, 0 otherwise (i.e., offset for
    Group 1)
    Regressor2: 1's for F1L1 F2L2, 0 otherwise (i.e, offset for
    Group 2)
    Regressor3: 1's for F1L2 F2L1, 0 otherwise (i.e., offset for
    Group 3)
    Regressor4: 1's for F1L2 F2L2, 0 otherwise (i.e., offset for
    Group 4)
    Regressor5: COV for Group1 subjects, 0 otherwise (i.e., COV
    slope for
    Group 1)
    Regressor6: COV for Group2 subjects, 0 otherwise (i.e., COV
    slope for
    Group 2)
    Regressor7: COV for Group3 subjects, 0 otherwise (i.e., COV
    slope for
    Group 3)
    Regressor8: COV for Group4 subjects, 0 otherwise (i.e., COV
    slope for
    Group 4)
    Regressor9: NUI for Group1 subjects, 0 otherwise (i.e., NUI
    slope for
    Group 1)
    Regressor10: NUI for Group2 subjects, 0 otherwise (i.e., NUI
    slope for
    Group 2)
    Regressor11: NUI for Group3 subjects, 0 otherwise (i.e., NUI
    slope for
    Group 3)
    Regressor12: NUI for Group4 subjects, 0 otherwise (i.e., NUI
    slope for
    Group 4)

    Description1: Does the correlation between thickness and COV,
    accounting for F1 and F2, differ from 0? Nuisance factors: NUI
    Contrast1: [0  0  0  0  0.25  0.25  0.25  0.25  0  0  0  0]

    Best,
    Daniel

    -- 
    Daniel (Yung-Jui) Yang, Ph.D.
    Postdoctoral Researcher
    Yale Child Study Center
    New Haven, CT
    Tel: (203) 737-5454
    E-mail: _yung-jui.yang@yale.edu_ <mailto:_yung-jui.yang@yale.edu_>


    _______________________________________________
    Freesurfer mailing list
    Freesurfer@nmr.mgh.harvard.edu
    <mailto:Freesurfer@nmr.mgh.harvard.edu>
    https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer


-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
Phone Number: 617-724-2358
Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2
www.nmr.mgh.harvard.edu/facility/filedrop/index.html
Outgoing:
ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

_______________________________________________
Freesurfer mailing list
Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu>
https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer


The information in this e-mail is intended only for the person to
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the e-mail
contains patient information, please contact the Partners
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Yang, Daniel

4:07 p.m.

Doug, sorry, I am not sure I can fully understand.

Do you mean the results are weighted MORE toward groups with smaller sample sizes (than groups with larger sample sizes)?

-- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: yung-jui.yang@yale.edu

On 2/18/14 2:13 PM, "Douglas N Greve" <greve@nmr.mgh.harvard.edumailto:greve@nmr.mgh.harvard.edu> wrote:

It will tend to weight smaller groups by a proportion greater than the number of subjects in the group.

On 02/18/2014 01:58 PM, Yang, Daniel wrote: Thanks Doug! One follow-up question: since it's [0.25 0.25 0.25 0.25], would the effect be biased toward large sample sizes in one of the groups (versus the other groups)?

Or, does FreeSurfer qdec take care of the unequal cell, in a possible way analogous to using Type III SS in the traditional ANOVA?

Best, Daniel -- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: _yung-jui.yang@yale.edu_mailto:_yung-jui.yang@yale.edu_

On 2/18/14 1:30 PM, "Douglas N Greve" <greve@nmr.mgh.harvard.edumailto:greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu> wrote:

That looks right to me doug

On 02/18/2014 10:08 AM, Yang, Daniel wrote:

Dear FreeSurfer experts,

This model using the DODS method will have 12 regressors:

Description1: Does the correlation between thickness and COV, accounting for F1 and F2, differ from 0? Nuisance factors: NUI Contrast1: [0 0 0 0 0.25 0.25 0.25 0.25 0 0 0 0]

Best, Daniel

-- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: _yung-jui.yang@yale.edu_mailto:_yung-jui.yang@yale.edu_ mailto:_yung-jui.yang@yale.edu_

_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edumailto:Freesurfer@nmr.mgh.harvard.edu mailto:Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

-- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edumailto:greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422

-- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edumailto:greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422

Douglas Greve

11:25 p.m.

Let's say you have four groups with 10 20 30 40 (100 total). The first group would get a weight of .25 where it only had 10% of the total. I don't think there is any way around this.

On 2/18/14 4:07 PM, Yang, Daniel wrote:

...

Doug, sorry, I am not sure I can fully understand.

Do you mean the results are weighted MORE toward groups with smaller sample sizes (than groups with larger sample sizes)?

-- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: _yung-jui.yang@yale.edu_

On 2/18/14 2:13 PM, "Douglas N Greve" <greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu> wrote:

  It will tend to weight smaller groups by a proportion greater
than the
number of subjects in the group.



On 02/18/2014 01:58 PM, Yang, Daniel wrote:

    Thanks Doug! One follow-up question: since it's [0.25  0.25  0.25
      0.25], would the effect be biased toward large sample sizes
    in one of
    the groups (versus the other groups)?

    Or, does FreeSurfer qdec take care of the unequal cell, in a
    possible
    way analogous to using Type III SS in the traditional ANOVA?

    Best,
    Daniel
    -- 
    Daniel (Yung-Jui) Yang, Ph.D.
    Postdoctoral Researcher
    Yale Child Study Center
    New Haven, CT
    Tel: (203) 737-5454
    E-mail: _yung-jui.yang@yale.edu_ <mailto:_yung-jui.yang@yale.edu_>

    On 2/18/14 1:30 PM, "Douglas N Greve"
    <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
    <mailto:greve@nmr.mgh.harvard.edu>
    <mailto:greve@nmr.mgh.harvard.edu%3E>> wrote:

         That looks right to me
         doug


         On 02/18/2014 10:08 AM, Yang, Daniel wrote:

             Dear FreeSurfer experts,

             I have two binary factors (F1: F1L1 F1L2; F2: F2L1
    F2L2), 1
             covariate
             (COV), and 1 nuisance factor (NUI). I want to make
    sense of some
             specification of the regressors and contrasts.
             Because they are not described
             in
    http://surfer.nmr.mgh.harvard.edu/fswiki/Fsgdf4G1V, I post my
             understanding below. Can you let me know if it is
    correct?

             This model using the DODS method will have 12 regressors:

             Regressor1: 1's for F1L1 F2L1, 0 otherwise (i.e.,
    offset for
             Group 1)
             Regressor2: 1's for F1L1 F2L2, 0 otherwise (i.e,
    offset for
             Group 2)
             Regressor3: 1's for F1L2 F2L1, 0 otherwise (i.e.,
    offset for
             Group 3)
             Regressor4: 1's for F1L2 F2L2, 0 otherwise (i.e.,
    offset for
             Group 4)
             Regressor5: COV for Group1 subjects, 0 otherwise
    (i.e., COV
             slope for
             Group 1)
             Regressor6: COV for Group2 subjects, 0 otherwise
    (i.e., COV
             slope for
             Group 2)
             Regressor7: COV for Group3 subjects, 0 otherwise
    (i.e., COV
             slope for
             Group 3)
             Regressor8: COV for Group4 subjects, 0 otherwise
    (i.e., COV
             slope for
             Group 4)
             Regressor9: NUI for Group1 subjects, 0 otherwise
    (i.e., NUI
             slope for
             Group 1)
             Regressor10: NUI for Group2 subjects, 0 otherwise
    (i.e., NUI
             slope for
             Group 2)
             Regressor11: NUI for Group3 subjects, 0 otherwise
    (i.e., NUI
             slope for
             Group 3)
             Regressor12: NUI for Group4 subjects, 0 otherwise
    (i.e., NUI
             slope for
             Group 4)

             Description1: Does the correlation between thickness
    and COV,
             accounting for F1 and F2, differ from 0? Nuisance
    factors: NUI
             Contrast1:
    [0  0  0  0  0.25  0.25  0.25  0.25  0  0  0  0]

             Best,
             Daniel

             --
             Daniel (Yung-Jui) Yang, Ph.D.
             Postdoctoral Researcher
             Yale Child Study Center
             New Haven, CT
             Tel: (203) 737-5454
             E-mail: _yung-jui.yang@yale.edu_
    <mailto:_yung-jui.yang@yale.edu_>
    <mailto:_yung-jui.yang@yale.edu_>


    _______________________________________________
             Freesurfer mailing list
    Freesurfer@nmr.mgh.harvard.edu
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             <mailto:Freesurfer@nmr.mgh.harvard.edu>
    https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer


         --
         Douglas N. Greve, Ph.D.
         MGH-NMR Center
    greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
    <mailto:greve@nmr.mgh.harvard.edu>
         Phone Number: 617-724-2358
         Fax: 617-726-7422

         Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
         FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2
    www.nmr.mgh.harvard.edu/facility/filedrop/index.html
         Outgoing:
    ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

    _______________________________________________
         Freesurfer mailing list
    Freesurfer@nmr.mgh.harvard.edu
    <mailto:Freesurfer@nmr.mgh.harvard.edu>
    <mailto:Freesurfer@nmr.mgh.harvard.edu>
    https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer


         The information in this e-mail is intended only for the
    person to
         whom it is
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    error and
         the e-mail
         contains patient information, please contact the Partners
         Compliance HelpLine at
    http://www.partners.org/complianceline . If the e-mail was sent to
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         but does not contain patient information, please contact the
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-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
Phone Number: 617-724-2358
Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2
www.nmr.mgh.harvard.edu/facility/filedrop/index.html
Outgoing:
ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

_______________________________________________
Freesurfer mailing list
Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu>
https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

Yang, Daniel

19 Feb 19 Feb

7:56 p.m.

Got it! I guess we may work around by specifying weighted contrast like [ 0.1 0.2 0.3 0.4 ] ? -- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: yung-jui.yang@yale.edu

On 2/18/14 11:25 PM, "Douglas Greve" <greve@nmr.mgh.harvard.edumailto:greve@nmr.mgh.harvard.edu> wrote:

Let's say you have four groups with 10 20 30 40 (100 total). The first group would get a weight of .25 where it only had 10% of the total. I don't think there is any way around this.

On 2/18/14 4:07 PM, Yang, Daniel wrote: Doug, sorry, I am not sure I can fully understand.

Do you mean the results are weighted MORE toward groups with smaller sample sizes (than groups with larger sample sizes)?

-- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: yung-jui.yang@yale.edumailto:yung-jui.yang@yale.edu

On 2/18/14 2:13 PM, "Douglas N Greve" <greve@nmr.mgh.harvard.edumailto:greve@nmr.mgh.harvard.edu> wrote:

It will tend to weight smaller groups by a proportion greater than the number of subjects in the group.

Or, does FreeSurfer qdec take care of the unequal cell, in a possible way analogous to using Type III SS in the traditional ANOVA?

Best, Daniel -- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: _yung-jui.yang@yale.edu_mailto:_yung-jui.yang@yale.edu_

On 2/18/14 1:30 PM, "Douglas N Greve" <greve@nmr.mgh.harvard.edumailto:greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu%3E> wrote:

That looks right to me doug

On 02/18/2014 10:08 AM, Yang, Daniel wrote:

Dear FreeSurfer experts,

This model using the DODS method will have 12 regressors:

Description1: Does the correlation between thickness and COV, accounting for F1 and F2, differ from 0? Nuisance factors: NUI Contrast1: [0 0 0 0 0.25 0.25 0.25 0.25 0 0 0 0]

Best, Daniel

-- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edumailto:greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.htmlhttp://www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

-- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edumailto:greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.htmlhttp://www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

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Douglas Greve
Douglas N Greve
Yang, Daniel