Fix to 3.1.8 - inadvertent typo in measurement_from_sds leading to wrong answers
3.1.8
BUG FIX In the measurement_for_sds function x = M (1 + L S z)^(1/L) In some cases, (1 + L S z) is negative, making a power calculation not possible. Added fix tests for these cases and returns None
Bug Fix in the basic measurement_for_sds and z_score functions, the python math library generate an error if the exponent in math.pow is expressed as scientific notation. This is removed if the ** operator is used. Refactored in this update.
3.1.5
Bug Fix: if producing custom SDS lines on charts, labels report SDS, not centiles
3.1.4
Add is_sds flag to create_chart. This will allow creation of charts with custom SDS formats, as well as custom centile formats