Recently the Australian and New Zealand Water Quality Guidelines (ANZECC) have been updated (Warne et al 2018) and one significant change was the preference of ‘No Effect Concentrations (NECs)’ above other statistical estimates of toxicity such as EC10s and NOECs. Here is a condensed list of the hierarchy from the Guidelines. NECs ECx where x […]

In my previous posts, I showed how we can use simulated data to calculate power and sample size analyses, and estimate distributions around the effect size. But we can also use simulated data to estimate error around p-values. Unless you have been living under a rock, you should know p-values have been getting smashed for […]