For gastroplus modeling - can I determine the D90 from the specified D50 and SD/bins from the particle entry section? I've modeled several scenarios using a specified D50 and SD and # bins, but I'd like to know what my D90 is. Is this possible to determine?
Isabel Foreman-Ortiz The lognormal distribution is a 2-parameter model and thus if you have the mean and the standard deviation, every point in the distribution is defined and can be calculated - the number of bins is irrelevant to this calculation; it's a continuous distribution. If I understand you correctly, then a calculator such as:
https://homepage.divms.uiowa.edu/~mbognar/applets/lognormal.html
should work. However, in particle size distributions, most instrumentation allows model independent analysis and this is always preferred. Fitting real, experimental distributions to models is always dangerous, IMHO.
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