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I'm sorry, I'm suffering cause I'm struggling with stadistics, I don't like investigation but I'm working on my thesis, could you help me please? I need to compare three groups, how the hell I do that?

Wow this is stellar work. I have always wanted to know the science and body knowledge behind power hits. If only I knew and came across this years ago. I would have practiced with such knowledge in mind.

In computer science, we used to refer to "pose estimation" as "articulated object tracking," where "pose estimation" referred to the problem of determining the camera pose and the object pose in 3D space. However, the term has become ubiquitous and is now commonly used to mean the posture of a human being in an image or video.

this is point of view from H1. Type 1 being we accept H1 even though it is not true. Type 2 on the other hand is rejecting H1 even though H1 is true.

can you say book for cricket biomechanics

15:13 can’t wrap my head around this. Is the line coming perpendicular to both thorax and pelvis?. For practical purposes, how is this angle created? By moving your hips and shoulders in opposite direction?. For example, if a batter before ball is delivered stands in a way that his hips are somewhat horizontal (ie in the direction of the cricket stumps, while his shoulders are in one line facing the bowler, ie side on. This would result a slight twist in back but is this what you are referring to the X factor?” Theoretically, would changing the batting stance in a way that hips are facing the leg side boundary and shoulders facing the bowler before ball is delivered generate more power?. Thank you for the informative content you produce.

Hello Stuart. How about a 3 groups non directional test. We have 25 participants in each group, total of 75 and we would like to run the power analysis. Thanks.

I am Physio from Pakistan Cricket Board, I agree with the difference of IO muscle thickness in fast bowler and also in spinner who have more rotatory component in their action. This difference is obvious in all active bowlers and might diminish in non active bowlers, this difference is perhaps due to inactivity of injured bowler during injury, not a primary cause of that injury.

Bless your soul!!! Simple, easy to understand, and to the point! Thank you so much!

So glad my professor Peter Lamb recommended this series for a stats primer/reminder. Very informative!

Could you please tell estimated sample size assuming allele frequency 0.1 (10%), additive model, effect size is 2, and disease prevalence 7% with 0.05 % signig=ficance level

Thanks for creating this

Does the population matter? Where do you input the population?

What type of DEMO software is used for explanation??

How can I get a small portion of respondents from a specific amount of population? I have 351 for total population. I just want to get a portion of that population. How do I do that?

Hi Stuart, this is really helpful. Hopefully you still read comments on here as I have a question please! Is it possible to obtain the specific percentages that the significant differences occur at? For example, for the four shaded areas these would seen to occur at ~0-30%, 35-65%, 75-85% and 95-100%. However, I was wondering if these can be calculated (perhaps with confidence interval too) and reported from MATLAB? Best, Ben

Do big strong muscles contribute to six hitting? Sir please reply

useful an well presented...would like the steps been drop at the comment section

Great stuff ! Maximum thanks

Amazing lecture! Thank you so much.

Skeleton helmet 🧿🛸 you and tuks need helmet 🪖

Thank you so much for the video.

is this applicable for mediation analysis?

How to straighten a curvy base, please? I have a green and a red electrode I place on the patient along with a concentric needle

really nice but would be even better with explanation and meaning of alternative hypothesis

Amazing knowledge thank you

This pseudo science for dumbies.

Hi, can you show how to calculate a sample size for an epidemiological study? Thank you!

Thank you for your simplified explanation

Thanks for the video. Excellent work.

Hi Stuart, is there any way to save an online backup of all files added to Mendeley References? Thus, not on the laptop itself/desktop.

Wow, as an aerialist this was super interesting and insightful. Have to say Gareth is a great speaker, calm and really engaging. Look forward to more.

but if the sample is small (you have 11 subjects and i have 8), shouldn't we use a non parametric test like Wilcoxon?

Hi, This video was quite interesting, but may I know the angle you are mentioning is at what reference point w.r.t which plane ?

Send me your email address

Nice

Type I error = Illusion (you are seeing an effect when there is not one) Type 2 error = 2 blind 2 see (you are failing to see an effect when there is one)

couldn't get a poorer quality than that? appreciate the content though

excellent Tutorial. Would look forward for more reference manager tutorials

Simply Brilliant. Thanks a lot

Thanks for the brilliant research and presentation. It was enlightening.

Thanks a lot for sharing the cool work.

Hi I could use your help determining a sample size for a research study

Bravo, Johannes!

How do I calculate the sample size for a four arm RCT.

Seems like you erroneously state that the effect size box is for inputting the desired effect size but it is actually where you input the effect size you think your intervention or between-condition effect may be. This is why the sample size actually decrease when you increased the value in the effect size box. This is obviously a pretty important issue and the video should be edited to correct the issue.

Many congratulations. Great presentation. I havent found the study that you present in 39:20 to 43:00 min (flywheel and Smith machine squats - a comparison). Do you have a title or a link? Thanks

Another note, with regard to the interesting discrepancy between forehand trunk speeds of ATP pros and high performance juniors of 16 years old. The professor’s speculative explanatory comment is based once again on some unwarranted assumption like that the technique used by the pros were optimal and/or that there were a linear relation between trunk speed and racquet speed in the upper range of trunk speeds. That is hardly the case in either. It is also highly suspectible that the juniors could generate almost as fast racquet head speeds by ”using upper limbs/shoulder areas” if the pros had optimal techniques utilising efficiently the trunk rotational energy in their forehand speeds. It might rather be argued that the juniors achieve almost the same forehand speed output by much less energy spent by being more relaxed in their arm and shoulder areas than the energy wasting pros: so much work for so scant results! It all can just be due to the pros over-powering the forehand swings by too tight (and muscular and heavy) arms while grunting along! Less is more, guys. Just saying. Learn from the kids.

Important observations posing further questions. The serve seems to be the great unknown forever eluding biomechanical analysis as this analysis conventionally and quite problematically presupposes and takes as a given something that should be addressed first and foremost: What is the optimal, most efficient configuration of the body segements in the load phase/trophy positon (the role and function of different bends, tilts and rotations and the question of their possible sequential coordination and degress of emphasis: back tilt: sommersault (nor squatting!), hip intrusion and the related shoulder tilt: cartwheel, trunk and shoulder/upper arm rotation : spin)? Is it even an intelligible/valid/pedagogically optimal approach to view serve power as a net sum springing out of different power sources attributed to different muscle groups and body parts each of which then allegedly contributing with a given, more or less arbitrary rate (%) to the final product measured in serve speed? What do we even and exactly mean with this loosely used term ”leg drive”? What is its real role in the serve - it should be revisited and by the same token clarified the relation between this so called leg drive and the role of core muscles in the serve dynamics (see the first point above). And finally, related to the critized piecemeal framework allocating rations of serve power to the different body segments, what parts and motions of the body/serve are active generators and what rather passive followers in the complete and optimal service action? This comment also serves as a general (implicit) critique of all such biomechanical models and frameworks that incorporate unproblematically and ”quite pragmatically” these unwarranted putative presumption without addressing such fundamental questions as posed above and thus producing these ”elaborate” multi-phase/stage models like the serve 8-stage model by Kovacs et al. This kind of reductive analytics employed in the conceptualization of harmonized fluid atheltic motions of emergent nature are good at missing the forest for the trees which might even not be not there!

Sir I have grade 1 anterolisthesis so can I continue fast bowling