search for: cnct_o

...¦logit¡¦) ¡¨. This works fine when test .value and concentration (cnct) are continuous vairables. However, concentration is in fact a grouping variable over 5 experiments with 5 concentrations ( 25, 50, 100, 200 & 400). Therefore I believe concentration to be an ordered factor ( in model : cnct_o). To make this model I used the ¡§rms¡¨ library (previously known as Design) and functions lrm (or Glm). The lrm (or Glm) returns the odds for disease, the ¡§inv.logit (odds) ¡¨ gives the probability of disease, but I have to do this with the Predict function of the ¡§rms¡¨ package. ##### The r...