Table 2.

Sociodemographic characteristics of hypothetical convenience samples, by SES, ethnicity, and type of convenience sample

	SES
	Low	Medium	High
Ethnicity
	a) Conventional convenience samples
Black	30% White/70% Black M SES = −1.5 (−2.5|2.5)	25% White/75% Black M SES = 0.0 (−2.5|2.5)	15% White/85% Black M SES = 1.5 (−2.5|2.5)
White	90% White/10% Black M SES = −1.5 (−2.5|2.5)	92% White/8% Black M SES = 0.0 (−2.5|2.5)	88% White/12% Black M SES = 1.5 (−2.5|2.5)
	b) Homogeneous convenience samples
Black	0% White/100% Black M SES = −1.5 (<−1.0)	0% White/100% Black M SES = 0 (≥ −1.0 and ≤ 1.0)	0% White/100% Black M SES = 1.5 (> 1.0)
White	100% White/0% Black M SES = −1.5 (<−1.0)	100% White/0% Black M SES = 0 (≥ −1.0 and ≤ 1.0)	100% White/0% Black M SES = 1.5 (> 1.0)

Note: For each conventional convenience sample, participants from all levels of SES are represented to some extent. For example, among the Low SES conventional convenience samples, although the average SES is −1.5, there are some participants with Medium (≥ −1.0 and ≤ 1.0) and High SES (> 1.0) as well. For each homogeneous convenience sample, participants from only a single level of SES are represented. For example, among the Low SES homogeneous convenience samples, the samples are limited to those with Low SES (<−1.0).