# IRT: Standard errors for intercepts vs. locations

In item response theory (IRT), the argument of the logit function can be expressed using a discrimination (a) and an intercept (b) as $a \theta + b$ or using a discrimination and location (c) as $a ( \theta - c )$

In the output from my estimating software, I was provided estimates and standard errors (SE) for the intercept parameters. I would like to report locations instead of intercepts. My question is this: Can the SE for the location be computed from the SE for the intercept and the discrimination as $SE(c)=\frac{SE(b)}{a}$ ? I am afraid this is not the case, since the discrimination is also estimated.