![]() The relation between pretreatment and posttreatment blood pressure could be examined with simple linear regression because both variables are quantitative. ![]() This variable should therefore be taken into account as well. Now, posttreatment blood pressure is known to correlate strongly with pretreatment blood pressure. Our company wants to know if their medicine outperforms the other treatments: do these participants have lower blood pressures than the others after taking the new medicine? Since treatment is a nominal variable, this could be answered with a simple ANOVA. The data -partly shown below- are in blood-pressure.sav. They tested their medicine against an old medicine, a placebo and a control group. SPSS ANCOVA Output - Between-Subjects EffectsĪ pharmaceutical company develops a new medicine against high blood pressure.SPSS ANCOVA – Beginners Tutorial By Ruben Geert van den Berg under ANOVA & Statistics A-Z
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