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CSU - PSY 320 - Class Notes - Week 17

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Schools > Colorado State University > Psychology > PSY 320 > CSU - PSY 320 - Class Notes - Week 17

CSU - PSY 320 - Class Notes - Week 17

School: Colorado State University
Department: Psychology
Course: Abnormal Psychology
Professor: Martha Amberg
Term: Fall 2016
Tags: Psychology, abnormalpsychology, PSY320, and Amberg
Name: PSY 320 Week 14 Notes
Description: substance use disorders and gambling disorder Prof Amberg
Uploaded: 12/02/2016
0 5 3 34 Reviews
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background image 4/26/16  
Quasi-­Experimental  Designs  
-­   Used  when  control  features  of  experimental  designs  cannot  be  achieved   ●   Independent  variable  cannot  be  manipulated   ○   Ethics  (smoking)  
○   Previously  existing  groups  (gender)  
●   Random  assignment  can’t  be  used   -­   Internal  Validity  is  lower   ●   History   ○   Unintended  event  that  takes  place  between  first  and  second   measurements   ●   Maturation   ○   Changes  that  occur  naturally  over  time   ●   Attrition/Mortality   ○   Participants  drop  out  before  posttest   ●   Regression  to  the  mean  and  testing  effects  with  some  designs   -­   Types  of  quasi-­experiments:   ●   Pretest-­posttest  Design   ○   Simple  pretest-­posttest   ■   Pretest  →  Treatment  →  Posttest    ○   Pretest-­posttest  with  nonequivalent  groups   ■   Control:     Pretest  →  Posttest    ■   Experimental:     Pretest  →  Treatment  →  Posttest    ○   Pretest-­posttest  with  nonequivalent  groups  -­  two  pretests   ■   Control:   Pretest     Pretest  →  Posttest    ■   Experimental:     Pretest  →  Pretest  →  Treatment  →   Posttest    ○   Pretest-­posttest  with  nonequivalent  groups  -­  Switch  conditions   ■   Group  1:   Pretest  →  Treatment  →  Posttest  →  Posttest    ■   Group  2:   Pretest   →  Pretest  →  Treatment  →  Posttest    ○   Solomon  four-­group  design   ■   Group  1   ●   Control:     Pretest  →  Posttest    ●   Experimental:     Pretest  →  Treatment  →  Posttest    ■   Group  2   ●   Control:   No  Pretest   →  Posttest    ●   Experimental:     No  Pretest  →  Treatment  →  Posttest    ●   Time  Series   ○   Interrupted  time  series  design   ■   Many  pretests  and  posttests  (evaluate  patterns)  
■   IV  =  independent  event  that  researchers  do  not  control  
■   Archival  data  
○   Non  Interrupted  time  series  design   ■   Many  pretests  and  posttests  (evaluate  patterns)  
■   IV  =  researcher  implements  treatment  
background image 4/27/16  
Developmental  Research  Designs  
-­   Cross-­sectionals  Design  -­  persons  of  different  ages  measured  at  the  same  point  in  time   ●   Age  =  between  subjects  variable    
●   Pros  
○   Practical/efficient  
○   Reduced  chance  of  attrition/mortality  
○   No  testing  effects  
●   Cons   ○   Generation  effects  (cohort  effects)   -­   Longitudinal  Design  -­  same  group  is  observed  at  different  times  as  they  age   ●   Age  =  within-­subjects  variable  
●   Pros  
○   More  complete  picture  of  development   ●   Cons   ○   Takes  time  for  participants  to  age  
○   Attrition/Mortality  
○   Testing  Effects  
-­   Cohort  Sequential  Design  -­  persons  of  different  ages  measured  at  the  same  point  and   then  tracked  over  time  as  they  age   ●   Age  =  between  subjects  AND  within  subjects  variable  
●   Pros  
○   Takes  time  for  participants  to  age  
○   Attrition/Mortality  
○   Testing  Effects  
●   Cons   ○   Can  still  compare  different  ages  quickly  
○   Takes  care  of  generation  (cohort)  effects  
○   More  complete  picture  of  development  
   -­   Generational/Cohort  effects  -­  Certain  generations  behave  in  particular  ways  because   they  have  shared  experiences  separate  from  other  generations     
4/29/16  
Small-­n  Designs  
-­   Small-­n  =  small  sample  size  
-­   Would  use  small-­n  design  when:  
●   You  want  to  better  describe  behavior  or  change   -­   Different  from  case  study:   ●   Case  study  -­  get  better  understanding  of  behavior  we  don’t  know  much  about,   usually  just  one  person   ●   Small-­n  design  -­  is  an  experiment  testing  a  theory,  more  than  one  person   -­   Also  called  single-­subject  or  single-­case  designs  
-­   Two  types:  

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School: Colorado State University
Department: Psychology
Course: Abnormal Psychology
Professor: Martha Amberg
Term: Fall 2016
Tags: Psychology, abnormalpsychology, PSY320, and Amberg
Name: PSY 320 Week 14 Notes
Description: substance use disorders and gambling disorder Prof Amberg
Uploaded: 12/02/2016
3 Pages 48 Views 38 Unlocks
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