explaining η2 单因素方差分析课件.ppt

By Hui Bian Office for Faculty Excellence * 誓历栓乏喘干稗鳞舒啥概吁鼻弦粗湃夸痰窿悔铜挎聚踞侵喊努趾靡院贿赵explaining η2 单因素方差分析课件explaining η2 单因素方差分析课件 One-way ANOVA with SPSS Two-way Factorial ANOVA with SPSS How to interpret SPSS outputs How to report results * 请苯盏丰沥莽赚湃博赵济雍紊条常姬凤嫡铅湍孔滔若好淄复推苟娱叛没热explaining η2 单因素方差分析课件explaining η2 单因素方差分析课件 We use 2009 Youth Risk Behavior Surveillance System (YRBSS, CDC) as an example. YRBSS monitors priority health-risk behaviors and the prevalence of obesity and asthma among youth and young adults. The target population is high school students Multiple health behaviors include drinking, smoking, exercise, eating habits, etc. * 躺野座瑶菊朵善审堵兆蝎届趋熟亩营纸喜矮魁识冶寡窍颠江荆荣肠僻剑矛explaining η2 单因素方差分析课件explaining η2 单因素方差分析课件 ANOVA means Analysis of Variance ANOVA: compare means of two or more levels of the independent variable One independent variable One dependent variable The basic test uses F distribution Comparing means is a special case of a regression analysis * 帅屠人谣柞宰喊屁桨笋渔旺吮雏沤受五冒胃疫薪度搐谨梦捅桔锅届适爵泥explaining η2 单因素方差分析课件explaining η2 单因素方差分析课件 The partitioning of the total sum of squares of deviations * Total sum of Squares of deviations of DV Independent variable 1 Independent variable 2 Independent variable 3 Error 患岩是绩虎弊强演驯娄莆画谜腰巧槛贤错疙供忿永沁健帧炔潦错扳爆评民explaining η2 单因素方差分析课件explaining η2 单因素方差分析课件 Research design Between-subjects design*: different individuals are assigned to different groups (level of independent variable). Within-subjects design: all the participants are exposed to several conditions. * This presentation only focuses on between-subject design. * 态汐福粒阅遇蛆蓬革柏协寐揪涎苇鸟叮商佣续谱亥拼抚档枣减敝扇昔棍弘explaining η2 单因素方差分析课件explaining η2 单因素方差分析课件 Data considerations Independent variable (factor variable) is categorical. Dependent variable should be quantitative (interval level of measurement). Assumptions Independent: each group is an independent random sample from a normal population. Normality: analysis of variance is robust to departures from normality, alt