For the MAD, in the Formula box simply type mad(attribute) and you should be able to calculate it. For the IQR, I'd create a univariate plot, then in the Measurement palette select Standard Deviation. You can then subtract the first quartile from the third.
For the MAD, in the Formula box simply type mad(attribute) and you should be able to calculate it. For the IQR, I'd create a univariate plot, then in the Measurement palette select Standard Deviation. You can then subtract the first quartile from the third.