+ Reply to Thread
Page 2 of 2 FirstFirst 1 2
Results 16 to 24 of 24

Thread: comparing the DEGREE of difference between data sets

  1. #16
    Super Moderator
    Points: 31,766, Level: 100
    Level completed: 0%, Points required for next Level: 0
    bugman's Avatar
    Posts
    2,255
    Thanks
    290
    Thanked 324 Times in 265 Posts

    Re: comparing the DEGREE of difference between data sets




    Look at the SIMIL package in R.
    The earth is round: P<0.05

  2. #17
    Points: 1,473, Level: 21
    Level completed: 73%, Points required for next Level: 27

    Posts
    13
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: comparing the DEGREE of difference between data sets

    Thanks for all the help bugman, I appreciate the time and effort.

    I can't seem to find the SIMIL package for R, and so think I will settle on euclidean distances.

    cheers

  3. #18
    Devorador de queso
    Points: 95,705, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Awards:
    Posting AwardCommunity AwardDiscussion EnderFrequent Poster
    Dason's Avatar
    Location
    Tampa, FL
    Posts
    12,931
    Thanks
    307
    Thanked 2,629 Times in 2,245 Posts

    Re: comparing the DEGREE of difference between data sets

    I can't seem to find it either. I can't say I looked too hard but I couldn't find it on the CRAN list of contributed packages either.

  4. #19
    Super Moderator
    Points: 31,766, Level: 100
    Level completed: 0%, Points required for next Level: 0
    bugman's Avatar
    Posts
    2,255
    Thanks
    290
    Thanked 324 Times in 265 Posts

    Re: comparing the DEGREE of difference between data sets

    SIMIL was cited in Numerical Ecology by Legendre and Legendre.

    try the package "proxy" in R.

    Feb. 2010.
    The earth is round: P<0.05

  5. #20
    Super Moderator
    Points: 31,766, Level: 100
    Level completed: 0%, Points required for next Level: 0
    bugman's Avatar
    Posts
    2,255
    Thanks
    290
    Thanked 324 Times in 265 Posts

    Re: comparing the DEGREE of difference between data sets

    Could you not use: method="chi.square" in the vegan pacakge?
    The earth is round: P<0.05

  6. #21
    Points: 1,473, Level: 21
    Level completed: 73%, Points required for next Level: 27

    Posts
    13
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: comparing the DEGREE of difference between data sets

    Ah, I found it in the proxy package. Thanks bugman.

    One last question...the NMDS graphs produced from my data using euclidean distances suggest very different, often opposite conclusions. Would this be expected simply because of using different distance measures?

    Also, thanks gianmarco, I will now use correspondence analysis for graphic representation of my results.

    cheers!

  7. #22
    Super Moderator
    Points: 31,766, Level: 100
    Level completed: 0%, Points required for next Level: 0
    bugman's Avatar
    Posts
    2,255
    Thanks
    290
    Thanked 324 Times in 265 Posts

    Re: comparing the DEGREE of difference between data sets

    Quote Originally Posted by psylocat View Post
    Would this be expected simply because of using different distance measures?
    cheers!
    A big fat YES.

    Choosing an appropriate dissimilarity measure to your data is extremely important to the output and your interpretation.
    The earth is round: P<0.05

  8. #23
    Points: 1,473, Level: 21
    Level completed: 73%, Points required for next Level: 27

    Posts
    13
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: comparing the DEGREE of difference between data sets

    gotcha...thanks again for all the help!

  9. #24
    Super Moderator
    Points: 31,766, Level: 100
    Level completed: 0%, Points required for next Level: 0
    bugman's Avatar
    Posts
    2,255
    Thanks
    290
    Thanked 324 Times in 265 Posts

    Re: comparing the DEGREE of difference between data sets


    Its a pleasure. Hopefully you have it all sorted now.
    The earth is round: P<0.05

+ Reply to Thread
Page 2 of 2 FirstFirst 1 2

           




Similar Threads

  1. Most Significant Difference Between 2 Data Sets
    By dbajric in forum General Discussion
    Replies: 1
    Last Post: 04-17-2011, 02:05 AM
  2. Comparing Sets of Data
    By Dumb_Chemissed in forum Statistics
    Replies: 6
    Last Post: 07-09-2010, 06:07 PM
  3. Comparing two data sets
    By chuparfaan in forum Statistics
    Replies: 0
    Last Post: 04-14-2010, 12:17 PM
  4. comparing two data sets of variance
    By azndude in forum Statistics
    Replies: 1
    Last Post: 04-19-2009, 11:09 PM
  5. Comparing two price data sets
    By utopianbl in forum Psychology Statistics
    Replies: 0
    Last Post: 01-26-2008, 12:46 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts






Advertise on Talk Stats