Hello,    I have some data on net nitrogen mineralization and the values range from negative to positive. I measured nitrogen mineralization over several days and obtained the net nitrogen mineralization. I tried the approach below but could not obtain an output to merge to my data set. @Rick_SAS  proc iml output original data   Thanks,   proc iml; use work.idnet2; read all var {NetNit }; LNetNit = log10(NetNit + 1 - min(NetNit )); /* translate, then transform */ LogNetNit = j(nrow(NetNit ),1,.); /* allocate missing */ idx = loc(NetNit > 0); /* find indices where Y > 0 */ if ncol(idx) > 0 then LogNetNit [idx] = log10(NetNit [idx]); print NetNit LNetNit LogNetNit ;   How do I obtain my output for further analysis? How do I obtain back-transformed means and standard errors?? With the LNetNit transformation, all values were positive? Is this acceptable? With the LogNeNit, I had a lot of missing data and negative values. ... View more