👋🏼 In this statistics video lecture we review common study designs (for collecting data), with a focus on collecting "observational data". Study designs are generally Observational or Experimental, with the majority of health research focussing on observational data. It is important that you understand a bit about the different designs for collecting data, and their implications/limitations on analysis and interpretations. Like to support us? you can Donate (bit.ly/2CWxnP2), Share our Videos, Leave us a Comment, Give us a Like 👍🏼 or write us a review! Either way We Thank You! 👍🏼find the Best Statistics & R Programming Language Tutorials here: ( goo.gl/4vDQzT )
One of the finest courses on statistics I've ever seen.very good course Understood so many concepts in this course. your explination is very good.Thank you sir.
Hi Professor! First of all, thank you for creating this series of videos! Could you please recommend some books with exercises and extra notes to use in parallel with the videos? Thanks again!
thank you for making this easy understand, with same case but different study design. tbh i'm trying to learn from different case and i still confused. this is very helpful
Hi Profesor! I must point out, that this video about study design was very helpful, however I am confused, regarding a study that is required before and after design (I believe its called pre-post design). In which group of studies is this design included? And can you please explain a little bit more about it. Thank you very much. Good day :)
We use a table heatmap using cohort analysis in customer retention over the months and it's percentage. We have cohort on the rows and it column are the months.
Thanks! They mostly mirror the following course I teach: courses.students.ubc.ca/cs/courseschedule?pname=subjarea&tname=subj-section&dept=SPPH&course=400§ion=001
Hello. I conducted a study 4 groups where. I measured impact of glass of water and image quality in certain medical exam. I took an image, gave them a glass of water and took another one, to measure image quality improvement. Is it a pre - post test study design? Or randomized control study? I performed this test on 103 random patients. Which 51 consecutive patients was first group, (image 1, image 2, water, image 3), 43 of them (received water, and took image 1 and image 2.) The rest had extra images to see how water behaves inside of the patient. Help me to clarify.
Hello, I am a beginner for research, I have an idea to start a research about the efficacy of steroid injection for different grades of trigger finger, is it possible to design as prospective cohort study? And how to calculate the sample size? thanks 😊😊
Can any one help me with this study what is the design of this study? Background In this nationwide study, we used the unique Danish registries to estimate the risk of suicide and deliberate self-harm in patients with congenital heart disease (CHD). Methods and Results We identified all Danish citizens receiving a diagnosis of CHD between 1977 and 2007. As a reference cohort, we randomly selected 10 citizens for each patient, matched by sex and birth year. Using the Fine and Gray competing risk regression, we estimated the cumulative incidences of suicide and self-harm, and Cox proportional regression analysis was used to compare the risk of suicide and deliberate self-harm in patients with CHD with the reference cohort. We identified 14 433 patients with CHD. Mean follow-up was 21.3 years, with a maximum follow-up of 42 years. Since the time of diagnosis, 2659 patients had died, with a median age of death of 23 years. A total of 15 patients had died by suicide, compared with 232 suicides in the reference cohort. Patients with CHD had a low and similar risk of dying by suicide when compared with the reference cohort (cause-specific hazard ratio, 0.81; 95% CI, 0.48-1.37; and subhazard ratio, 0.68; 95% CI, 0.41-1.16). We identified 336 events of self-harm among patients with CHD, and 3484 events in the reference group. The overall risk of deliberate self-harm was not increased in patients with CHD when compared with the reference group (subhazard ratio, 0.95; 95% CI, 0.85-1.06). Conclusions This is the first study to estimate the risk of suicide and deliberate self-harm in patients with CHD. We found that patients with CHD do not have an increased risk of suicide or deliberate self-harm when compared with a large reference cohort.
For case control, you said that a con is that it lacks temporality, and as an example you said we don't know how long they've been smoking. But before that you said in a case control, we can ask about their smoking habits, such as how long they've been smoking. Can you explain this discrepancy...?
In case control you are not following individuals forward in time, so you have no time element. For temporarily you can think of a cohort followed over time. Here there is temporality as you follow individuals from exposure (X) until the outcome (Y).
