Proc template - log scale to show negative samples

mape — Wed, 24 May 2023 06:37:43 GMT

Dear community,

I have produced a scatter plot using proc template and proc sgrender, with x-axis in log scale using:

layout overlay/ xaxisopts=( type=LOG LOGOPTS=(base=10 minorgrid=false minorticks=true viewmin=1 viewmax=10))

The feedback I got was that I must show also the observations with negative samples. So the x-axis should look like this:

How can I achieve this??

Many thanks for your support

Re: Proc template - log scale to show negative samples

ballardw — Wed, 24 May 2023 14:57:15 GMT

Since the LOG function is basically not defined for negative numbers I haven't a clue what your advisor or commentators are actually suggesting.

From the documentation associated with Layout Overlay and Log Axes:

The numeric data that is used for a log axis must be positive. If zero or negative values are encountered, a linear axis is substituted and the following note is written to the log:
NOTE: Log axis cannot support zero or negative values in the data range. The axis type will
      be changed to LINEAR.

If you must display negative X axis values then you aren't going to do it with Type=LOG axis. I would go back to the source of the feedback and see what they say about negative values and a LOG axis.

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Proc template - log scale to show negative samples

Re: Proc template - log scale to show negative samples