The phrase "a past study has shown" is correct and usable in written English.
It can be used when referencing findings or conclusions from a previous research study.
Example: "A past study has shown that regular exercise can significantly improve mental health."
Alternatives: "previous research indicates" or "earlier studies have demonstrated".
The 2010 cup is predicted to generate over $3.2 billion in total revenue (including TV), but the host will have to sell tickets at prices Africans can afford.None of the many past studies has shown a convincing, long-term economic benefit from hosting a big sporting event, says Stefan Szymanski, an economist at Imperial College, London.
Evidence from past studies has shown that farm size (farm asset value) is inversely proportional to participation in off-farm work.
A number of past studies have shown ineffectiveness of a two-fold cut-off as the basis for filtering out DEGs [ 24- 26] and low-magnitude transcriptional changes have been found to produce functionally significant changes [ 27- 29].
FSIQ values are a useful measure for such an assessment because past studies have shown that these scores correspond to work productivity and associated lifetime earnings.
A number of past studies have shown that peer effects are usually non-linear (see Lavy et al., 2012; Sund, 2009), and low-achieving students are more affected by the presence of better peers.
Ideally such comparisons of the epistatic components should be done in a formal statistical test, although past studies have shown that epistatic pleiotropic effects tend to be restricted to single traits [ 25, 13].
Students learn better in a climate that is more emotionally positive and less stressful, and past studies have shown a clear link between positive emotional classroom climates and academic achievement.
Past studies have shown an increase in cytologic adequacy with an increase in NAF volume [ 9].
We also chose to use a large octawalled umbrella to maximize coverage of an attached siRNA and because our past studies have shown that larger molecular umbrellas can cross lipid bilayers by passive transport faster than smaller analogs due to greater partitioning into the membrane.
While the percents may differ, past studies have shown a similar trend away from people identifying solely at either end of the gender binary.
