We have previously discussed the 4 parameter logistic (4PL) model. Sometimes you may see slightly different versions of the 4PL equation – these are all mathematically equivalent. However,... read more →
Recently our team at Quantics were working on an analysis for an ecotoxicology client which called for us to use the Jonckheere-Terpstra test for ordered differences which is recommended... read more →
This 3rd clinical trial design blog from Quantics Biostatistics takes an introductory look at how the various types of clinical endpoints (which we introduced in our previous blog) determine... read more →
Our recent paper, Estimation of Relative Potency from Bioassay Data that Include Values below the Limit of Quantitation (Francis Bursa, Kelly J. Fleetwood, Karie J. Hirst and Ann Yellowlees), discusses values... read more →
In ecotoxicology statistics there are three main types of data: continuous discrete quantal / binary Continuous data is that which can take a (numerical) value over a continuous range (e.g.... read more →