+ Reply to Thread
Results 1 to 2 of 2

Thread: Logistic Regression model: a significant predicting variable with low sensitivity?

  1. #1
    Points: 6, Level: 1
    Level completed: 11%, Points required for next Level: 44

    Posts
    1
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Logistic Regression model: a significant predicting variable with low sensitivity?




    Hi fellow forum members! Thank you in advance for your time! I used binary logistics regression (SPSS) to determine the relationship between ambient noise levels (a continuous variable on a logarithmic scale, dB) and a single dichotomous dependent variable ("yes" - 1- for whale positive detections, and "no" - 0 - for negative detections). The model was statistically significant overall, and the Odds Ratio shows that the independent continuous variable is a significant predictor of whale detections. However, although the specificity of the model is very high (98%), the sensitivity is very low, with an extremely low percentage of true positives (8%). My question is: if detections (my dependent yes/no variable) show a significant positive association with noise level, how can sensitivity be so low? Should I trust these results? Thank you for any suggestions! I am quite new at interpreting logistic regressions.

  2. #2
    TS Contributor
    Points: 12,227, Level: 72
    Level completed: 45%, Points required for next Level: 223
    rogojel's Avatar
    Location
    I work in Europe, live in Hungary
    Posts
    1,470
    Thanks
    160
    Thanked 332 Times in 312 Posts

    Re: Logistic Regression model: a significant predicting variable with low sensitivity


    hi,
    I assume you used some decision rule to identify a positive whale detection (like probability > 50%)? Could it be that the rule is the problem?
    regards

+ Reply to Thread

           




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