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tangare [24]
1 year ago
15

a.one of the major problems with cohort studies is loss to follow-up. b.confounders are not a problem with cohort studies since

these studies are essentially prospective in design. c.cohort studies are useful for examining multiple outcomes of a single rare exposure. d.cohort studies are generally quicker and less expensive than case-control studies.  
Social Studies
1 answer:
wlad13 [49]1 year ago
8 0

Loss of follow-up is a problem in most cohort studies and often introduces bias. It is a situation in which a researcher loses contact with a subject, resulting in missing data. Too many subjects failing follow-up diminish the internal validity of the study.

<h3>What is follow-up loss in cohort studies? </h3>
  • Follow-up loss introduces bias (observed deviation of relevant measures from what would have been observed without bias) if there is a difference in the likelihood of loss due to follow-up  related to exposure status and outcome.
  • In the clinical research trials industry, loss due to follow-up is defined as patients who were actively participating in a clinical research trial at some point but who lost themselves (due to errors in the computer tracking system or due to unavailability).
  • In cohort studies: 1) Imaging outcome, is loss of follow-up. 2) These are essentially prospective studies, so confounding factors are not an issue. 3) These studies help examine multiple outcomes from a single, infrequent exposure. 4) These are usually faster and cheaper than case-control studies.
<h3>What are advantage and disadvantages of cohort studies?</h3>
  • In general, the main advantage of cohort studies is the ability to study multiple exposures and multiple endpoints in a single cohort. This recording allows you to select index groups, so you can explore rare recordings.
  • A major weakness of cohort studies is that this type of study design can be time consuming and expensive for results that are rare or evolve over long periods of time. It's a question of research.

To learn more about cohort study visit:

brainly.com/question/4562396

#SPJ4

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Answer:

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Explanation:

The essence of what is a Relative Frequency Distribution is to devide the frequency of an event (in this case "the times that males spend each day thinking about females") by the total number of cases to get the % of how often the event occurs.

In this case, as example:

Say your distribution looks like this:

"the times that males spend each day thinking about females" : 10

"the times that males doesn't spend each day thinking about females": 15

"total" : 25

Relative Frequency Distribution

"the times that males spend each day thinking about females" : 10/25 = 0.4

"the times that males doesn't spend each day thinking about females": 15/25 = 0.6

"total" : 25/25 = 1

0.4 + 0.6 = 1

You can conclude from this that 40% is the times that males spend each day thinking about females

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4 years ago
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Answer: Using operant conditioning terminology, straightening the wire hanger and poking it behind the dryer would be the <u><em>operant</em></u><em> </em>and the retrieved sock would be the <u><em>reinforcing stimulus.</em></u>

Explanation:

Operant stimulus is when there is a result known as "three-term contingency." The  behavior or action can result in an award or even a punishment depending on the occasion.

Reinforcing stimulus is when a certain behavior is performed and the response is strengthened or decreased depending on the action taken. In this case, the soc was retrieved because Dolores used the wire hanger. This could of been a decreased behavior is she had not of straightened the wire hanger and the sock was not retrieved.

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Explanation:

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Answer: (B) Control environment

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