Strong correlation but weak t-test . How do I interpret this?

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Although the experimental tests were not significant,
can we conclude anything from the correlational
results?










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    up vote
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    down vote

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    enter image description here



    Although the experimental tests were not significant,
    can we conclude anything from the correlational
    results?










    share|cite|improve this question







    New contributor




    Sherry Salehian is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





















      up vote
      2
      down vote

      favorite
      2









      up vote
      2
      down vote

      favorite
      2






      2





      enter image description here



      Although the experimental tests were not significant,
      can we conclude anything from the correlational
      results?










      share|cite|improve this question







      New contributor




      Sherry Salehian is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      enter image description here



      Although the experimental tests were not significant,
      can we conclude anything from the correlational
      results?







      correlation






      share|cite|improve this question







      New contributor




      Sherry Salehian is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|cite|improve this question







      New contributor




      Sherry Salehian is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|cite|improve this question




      share|cite|improve this question






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      asked 2 days ago









      Sherry Salehian

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          The correlations suggest that the variables are related to each other in individuals (e.g. if an individual has an above-average score on "Distancing", then they will tend to also have an above average score on "Dangerous").



          Such correlations don't imply that there would be differences on any individual score between two groups (Remain objective vs Perspective taking); there might be but there might not be -- neither precludes such a correlation (though a substantial difference between groups on these measures would impact a correlation calculation that ignored this difference).



          Here's an illustration; the left plot shows a plot of two correlated variables where there's no difference in group means (groups indicated in blue vs reddish-brown). The second plot
          shows two correlated variables with a difference in group means on each variable but the differences are opposite in sign; this induces a small
          negative correlation if you ignore the group factor.



          plot showing correlated variables without and with difference in means across two groups on the two variables



          As we can see ignoring
          the grouping variable would lead to a mistaken impression of how the two variables are related.



          If the mean-shifts had been in the same direction on the two variables, the induced marginal correlation between the x and y variables would have been positive even though the variables might not have been related within groups:



          plot showing uncorrelated variables (within-group) with induced marginal correlation due to difference in group means




          can we conclude anything from the correlational results?




          Yes, it seems that some of those measures are correlated with each other.



          [However, we should carefully consider a caveat: if there's some variable or variables -- possibly ones on which we have no data -- which does cause a difference in means, that might in turn induce the correlations that are observed, just as with the last plot above. Whether that's an issue depends on what you're trying to do.]






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            1 Answer
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            active

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            up vote
            6
            down vote



            accepted










            The correlations suggest that the variables are related to each other in individuals (e.g. if an individual has an above-average score on "Distancing", then they will tend to also have an above average score on "Dangerous").



            Such correlations don't imply that there would be differences on any individual score between two groups (Remain objective vs Perspective taking); there might be but there might not be -- neither precludes such a correlation (though a substantial difference between groups on these measures would impact a correlation calculation that ignored this difference).



            Here's an illustration; the left plot shows a plot of two correlated variables where there's no difference in group means (groups indicated in blue vs reddish-brown). The second plot
            shows two correlated variables with a difference in group means on each variable but the differences are opposite in sign; this induces a small
            negative correlation if you ignore the group factor.



            plot showing correlated variables without and with difference in means across two groups on the two variables



            As we can see ignoring
            the grouping variable would lead to a mistaken impression of how the two variables are related.



            If the mean-shifts had been in the same direction on the two variables, the induced marginal correlation between the x and y variables would have been positive even though the variables might not have been related within groups:



            plot showing uncorrelated variables (within-group) with induced marginal correlation due to difference in group means




            can we conclude anything from the correlational results?




            Yes, it seems that some of those measures are correlated with each other.



            [However, we should carefully consider a caveat: if there's some variable or variables -- possibly ones on which we have no data -- which does cause a difference in means, that might in turn induce the correlations that are observed, just as with the last plot above. Whether that's an issue depends on what you're trying to do.]






            share|cite|improve this answer


























              up vote
              6
              down vote



              accepted










              The correlations suggest that the variables are related to each other in individuals (e.g. if an individual has an above-average score on "Distancing", then they will tend to also have an above average score on "Dangerous").



              Such correlations don't imply that there would be differences on any individual score between two groups (Remain objective vs Perspective taking); there might be but there might not be -- neither precludes such a correlation (though a substantial difference between groups on these measures would impact a correlation calculation that ignored this difference).



              Here's an illustration; the left plot shows a plot of two correlated variables where there's no difference in group means (groups indicated in blue vs reddish-brown). The second plot
              shows two correlated variables with a difference in group means on each variable but the differences are opposite in sign; this induces a small
              negative correlation if you ignore the group factor.



              plot showing correlated variables without and with difference in means across two groups on the two variables



              As we can see ignoring
              the grouping variable would lead to a mistaken impression of how the two variables are related.



              If the mean-shifts had been in the same direction on the two variables, the induced marginal correlation between the x and y variables would have been positive even though the variables might not have been related within groups:



              plot showing uncorrelated variables (within-group) with induced marginal correlation due to difference in group means




              can we conclude anything from the correlational results?




              Yes, it seems that some of those measures are correlated with each other.



              [However, we should carefully consider a caveat: if there's some variable or variables -- possibly ones on which we have no data -- which does cause a difference in means, that might in turn induce the correlations that are observed, just as with the last plot above. Whether that's an issue depends on what you're trying to do.]






              share|cite|improve this answer
























                up vote
                6
                down vote



                accepted







                up vote
                6
                down vote



                accepted






                The correlations suggest that the variables are related to each other in individuals (e.g. if an individual has an above-average score on "Distancing", then they will tend to also have an above average score on "Dangerous").



                Such correlations don't imply that there would be differences on any individual score between two groups (Remain objective vs Perspective taking); there might be but there might not be -- neither precludes such a correlation (though a substantial difference between groups on these measures would impact a correlation calculation that ignored this difference).



                Here's an illustration; the left plot shows a plot of two correlated variables where there's no difference in group means (groups indicated in blue vs reddish-brown). The second plot
                shows two correlated variables with a difference in group means on each variable but the differences are opposite in sign; this induces a small
                negative correlation if you ignore the group factor.



                plot showing correlated variables without and with difference in means across two groups on the two variables



                As we can see ignoring
                the grouping variable would lead to a mistaken impression of how the two variables are related.



                If the mean-shifts had been in the same direction on the two variables, the induced marginal correlation between the x and y variables would have been positive even though the variables might not have been related within groups:



                plot showing uncorrelated variables (within-group) with induced marginal correlation due to difference in group means




                can we conclude anything from the correlational results?




                Yes, it seems that some of those measures are correlated with each other.



                [However, we should carefully consider a caveat: if there's some variable or variables -- possibly ones on which we have no data -- which does cause a difference in means, that might in turn induce the correlations that are observed, just as with the last plot above. Whether that's an issue depends on what you're trying to do.]






                share|cite|improve this answer














                The correlations suggest that the variables are related to each other in individuals (e.g. if an individual has an above-average score on "Distancing", then they will tend to also have an above average score on "Dangerous").



                Such correlations don't imply that there would be differences on any individual score between two groups (Remain objective vs Perspective taking); there might be but there might not be -- neither precludes such a correlation (though a substantial difference between groups on these measures would impact a correlation calculation that ignored this difference).



                Here's an illustration; the left plot shows a plot of two correlated variables where there's no difference in group means (groups indicated in blue vs reddish-brown). The second plot
                shows two correlated variables with a difference in group means on each variable but the differences are opposite in sign; this induces a small
                negative correlation if you ignore the group factor.



                plot showing correlated variables without and with difference in means across two groups on the two variables



                As we can see ignoring
                the grouping variable would lead to a mistaken impression of how the two variables are related.



                If the mean-shifts had been in the same direction on the two variables, the induced marginal correlation between the x and y variables would have been positive even though the variables might not have been related within groups:



                plot showing uncorrelated variables (within-group) with induced marginal correlation due to difference in group means




                can we conclude anything from the correlational results?




                Yes, it seems that some of those measures are correlated with each other.



                [However, we should carefully consider a caveat: if there's some variable or variables -- possibly ones on which we have no data -- which does cause a difference in means, that might in turn induce the correlations that are observed, just as with the last plot above. Whether that's an issue depends on what you're trying to do.]







                share|cite|improve this answer














                share|cite|improve this answer



                share|cite|improve this answer








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