topic Statistical test between two variables? in New SAS User

Statistical test between two variables?

Justin12 — Fri, 03 May 2019 22:18:34 GMT

drug	placebo
105	160
110	140
108	150
112
	136
116	146
112	140
108
	150
114	138
	148
	150

	156
	152

I have this data that compares blood pressures. The placebo column is patients normal blood pressures and the drug column has their pressures after the drug is administered. I am trying to use a certain PROC statement to determine statistically whether the drug does lower pressures. So after I imported the data into SAS named 'blood' and I am running a simple t-test.

proc ttest data=blood;

paired drug*placebo;

run;

Does this make sense or should I use proq freq with the chisq option?

Re: Statistical test between two variables?

ballardw — Fri, 03 May 2019 22:29:55 GMT

If you research question is about "mean difference of measurement" then you ttest looks right though I hope you have more records.

Do take note than any subject that does not have both measurements will be excluded from the calculations.

If the same subject appears multiple times then you are into a "repeated measures" environment and ttest may not be appropriate.

Re: Statistical test between two variables?

Reeza — Fri, 03 May 2019 22:44:47 GMT

For a test like this you should run a paired test ideally, but do you have enough data? The documentation for PROC TTEST has an example I believe.

@Justin12 wrote:

drug placebo

105 160

110 140

108 150

112

136

116 146

112 140

108

150

114 138

148

150

156

152

I have this data that compares blood pressures. The placebo column is patients normal blood pressures and the drug column has their pressures after the drug is administered. I am trying to use a certain PROC statement to determine statistically whether the drug does lower pressures. So after I imported the data into SAS named 'blood' and I am running a simple t-test.

proc ttest data=blood;

paired drug*placebo;

run;

Does this make sense or should I use proq freq with the chisq option?

Re: Statistical test between two variables?

Justin12 — Fri, 03 May 2019 22:34:32 GMT

Ok, thanks. I do have more data, the above was just a small sample of it.

Re: Statistical test between two variables?

Reeza — Fri, 03 May 2019 22:45:59 GMT

Then a T-Test is the appropriate statistical test in this case, and a paired t-test. You should always make a graph too, a slope graph for all users and a histogram of the differences would be my suggestions.