Sampling and Measuring

Use the article by Tremblay and his colleagues (2004) and evaluate its sampling and measures.
Tremblay, R. E., Nagin, D. S., Séguin, J. R., Zoccolillo, M., Zelazo, P. D., Boivin, M., … & Japel, C. (2004). Physical aggression during early childhood: Trajectories and predictors. Pediatrics, 114(1), e43-e50.
Tremblay et al., 2004 (trajectories of aggression during childhood).pdf
Apply the guidelines from Chapters 6 and 8 and rate each one of them (listed below) on a scale of 1 to 5 (or N/A – not applicable, or I/I – insufficient information). Again, put your rating on the dotted line in front of each guideline and briefly explain each of your ratings in a sentence or two.
 Chapter 6 guidelines

____ 1.      Was random sampling used?
Explain:
____ 2.      If random sampling was used, was it stratified?
Explain:
____ 3.      If some potential participants refused to participate, was the rate of participation reasonably high?
Explain:
____ 4.    If the response rate was low, did the researcher make multiple attempts to contact potential participants?
Explain:
____5.     Is there reason to believe that the participants and nonparticipants are similar on relevant variables?
Explain:
____ 6.      If a sample is not random, was it at least drawn from the target group for the generalization?
Explain:
____ 7.      If a sample is not random, was it drawn from diverse sources?
Explain:
____ 8.     If a sample is not random, does the researcher explicitly discuss this limitation and how it may have affected the generalizability of the study findings?
Explain:
____ 9.      Has the author described relevant characteristics (demographics) of the sample?
Explain:
____ 10.    Is the overall size of the sample adequate?
Explain:
____ 11.    Is the number of participants in each subgroup sufficiently large?
Explain:
____ 12.    Has informed consent been obtained?
Explain:
____ 13.    Has the study been approved by an ethics review board (Institutional Review Board (IRB) if in the United States or a similar agency if in another country)?
Explain:
____ 14.    Overall, is the sample appropriate for generalizing?
Explain:
 
Chapter 8 guidelines
____ 1.      Have the actual items and questions (or at least a sample of them) been provided?
Explain:
____ 2.      Are any specialized response formats, settings, and/or restrictions described in detail?
Explain:
____ 3.      When appropriate, were multiple methods used to collect data/information on key variables?
Explain:
____ 4.      For published measures, have sources been cited where additional information can be obtained?
Explain:
____ 5.      When delving into sensitive matters, is there reason to believe that accurate data were obtained?
Explain:
____ 6.    Have steps been taken to keep the measures from influencing any overt behaviors that were observed?
Explain:
____ 7.      If the collection and coding of observations involves subjectivity, is there evidence of inter-rater (or inter-observer) reliability?
Explain:
____ 8.   If a measure is designed to measure a single unitary trait, does it have adequate internal consistency?
Explain:
____ 9.      For stable traits, is there evidence of temporal stability?
Explain:
____ 10.    When appropriate, is there evidence of content validity?
Explain:
____ 11.    When appropriate, is there evidence of empirical validity?
Explain:
____ 12.    Do the researchers discuss obvious limitations of their measures?
Explain:
____ 13.    Overall, are the measures adequate?
Explain: