Plomin et al. (1993): study US Colorado 1986
Publication
- Author(s):
- Plomin, R.; Braungart, J.M.; Campos, J.J.; Corley, R.P.; DeFries, J.; Emde, R.N.; Fulker, D. W.; Kagan, J.; Reznick, J.S.; Robinson, J.L.; Zahn-Waxler, C.
- Title:
- Genetic change and continuity from fourteen to twenty months: The MacArthur Longitudinal Twin Study
- Source:
- Society for Research in Child Development; Child Development, 1993, 64, 1354-1376
Investigation
- Public
- Same-sex twins, Colorado, United States, followed from 14 to 20 months, 1986-1989
- Sample
- Non-probability purposive sample
- Respondents
- N = 398
- Non Response
- Assessment
-
Behavioural observation
At 14 months: observation at home, 2 weeks later observation in laboratory
Happiness Measure(s) and Distributional Findings
- Full text:
-
Time sampled ratings of positive and negative affect made from video recordings of child behavior; 30 second intervals across 15 minutes of free play and 1minute intervals for 4 alternate 5 minute segments of the Bayley test
Assessment of discrete behaviors; observation schedule not reported
Rated on 4 step scale, scale labels not reported - Classification:
- A-CA-mi-tsb-?-4-a
- Author's label:
- Hedonic tone, positive and negative
- Remarks:
- Affect Balance computed by WDH team;
14 months: boys: M=0.89; girls: M=1.01
20 months: boys: M=1.05; girls: M=1.09
(overall mean computed by WDH team)
Positive Affect:
14 months: boys: M=2.27 sd=.24; girls: M=2.35 sd=.25
20 months: boys: M=2.35 sd=.25; girls: M=2.38 sd=.27
Negative Affect:
14 months: boys: M=1.38 sd=.33; girls: M=1.36 sd=.31
20 months: boys: M=1.30 sd=.27; girls: M=1.29 sd=.31 - Page in publication:
- 1337, 1362
- Observed distribution
- Summary Statistics
- On original range 1 - 4 On range 0-10
- Mean:
- 1.01 -
- SD:
- - -
- Full text:
-
Time sampling of prevalent mood during free play and Bayley test. Average of observations at 30 second intervals across 15 minutes of free play and 1 minute intervals for 4 alternate 5 minute segments of the Bayley test
Rated on 7 step scale, scale labels not reported - Classification:
- A-CA-mi-tsb-v-7-a
- Author's label:
- Overall Mood
- Remarks:
- 14 months: boys: M=4.6 sd=1.1; girls: M=4.9 sd=1.1
20 months: boys: M=4.9 sd=1.1; girls: M=5.0 sd=1.2 - Page in publication:
- 1357, 1362
- Observed distribution
- Summary Statistics
- On original range 1 - 7 On range 0-10
- Mean:
- 4.85 6.42
- SD:
- 1.13 1.88