topic Re: Dochotomized line graph with variables along x axis - HELP! in Graphics Programming

Dochotomized line graph with variables along x axis - HELP!

GMartel — Mon, 13 May 2019 16:38:13 GMT

Hi,

I am trying to create a line graph for pressure measurements made a various time points. Each time point variable contains pressure measurements for each subject (eg. t1, t2, t3, t4, etc.). These time point variables should each form my x-axis. The pressure measurements within each variable should me my y axis. I then have an intervention coded 1/0, for which I would like to dichotomize the data, creating two line graphs.

I am hoping to plot means with error bars (SD or SE).

I have tried to look through posts and synthax guides but I am not finding a way to plot the x-axis as being each of my t1, t2, t3, t4 etc variables.

I am using 9.4.

Please help!

Guillaume Martel

Re: Dochotomized line graph with variables along x axis - HELP!

PaigeMiller — Mon, 13 May 2019 17:04:21 GMT

The best way to do this is to create a numeric variable (let's call it TIME) which has numbers 1 through 4, and then draw a plot of Y versus TIME.

For example: (untested code)

proc sgplot data=have;
    series x=time y=y/group=intervention;
run;

Re: Dochotomized line graph with variables along x axis - HELP!

Reeza — Mon, 13 May 2019 18:21:13 GMT

1. Summarize your data so that it's ready to graph - don't expect SAS procs to do the calculations for you - that's a lot harder to get for a line chart specifically.

2. Use SGPLOT to create your graphics.

The graph gallery has many examples - see line chart.

https://documentation.sas.com/?docsetId=grstatproc&docsetTarget=n121lznfa1jnlvn1q95t0r5sd2gq.htm&docsetVersion=9.4&locale=en#n0439r26gfqvy9n1tzvs9ejj42rh

Do you want a graph with two lines, two graphs side by side for easier comparison (SGPANEL) or two entirely separate graph objects?

@GMartel wrote:

Hi,

I am trying to create a line graph for pressure measurements made a various time points. Each time point variable contains pressure measurements for each subject (eg. t1, t2, t3, t4, etc.). These time point variables should each form my x-axis. The pressure measurements within each variable should me my y axis. I then have an intervention coded 1/0, for which I would like to dichotomize the data, creating two line graphs.

I am hoping to plot means with error bars (SD or SE).

I have tried to look through posts and synthax guides but I am not finding a way to plot the x-axis as being each of my t1, t2, t3, t4 etc variables.

I am using 9.4.

Please help!

Guillaume Martel

Re: Dochotomized line graph with variables along x axis - HELP!

GMartel — Wed, 15 May 2019 13:24:38 GMT

Thank you! I will review the documentation.

I can output the means + standard deviations/standard errors for team time point variable. Would you say that that is the simplest way to proceed?

I am hoping to create one graph with two lines. The actual line is optional. This is an example of what I am hoping to generate.

Re: Dochotomized line graph with variables along x axis - HELP!

PaigeMiller — Wed, 15 May 2019 13:41:51 GMT

The HIGHLOW command of PROC SGPLOT will certainly create such a plot. You would have to compute the uppper and lower confidence interval limits yourself before running PROC SGPLOT.

Re: Dochotomized line graph with variables along x axis - HELP!

GMartel — Wed, 15 May 2019 14:02:20 GMT

Thank you I will give it a try!