Parametric and Nonparametric Tests

Parametric and non-parametric tests: If you want to calculate a hypothesis test, you must first check the prerequisites of the hypothesis test. A very common requirement is that the data used must be subject to some distribution, usually the normal distribution. If your data are normally distributed, parametric tests can usually be used, if they are not normally distributed, non-parametric tests are usually used.
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[@datatab]

If you like, please find our e-Book here: datatab.net/statistics-book 😎

[@gbassaykamara1457]

I am grateful for finding your videos. I have been having great difficulties in finding the difference between Parametric and Non-Parametric Tests. I am a Statistics major student at the University of Sierra Leone (USL) and I believe I am in the right place for learning more about my course. Thank you @DATAtab

[@datatab]

Great to hear! Many thanks for your feedback!!! Regards Hannah

[@Chillersnowman]

​@@datatabI have test at wednesday, good luck for me.😅😅😅😅

[@Sarah_Pixie]

@@Chillersnowman You got this!!

[@johneagle4384]

Thank you. The table showing the parametric tests and their non-parametric counterparts is very useful.

[@datatab]

Glad it was helpful!

[@UnapologeticallyMuslimah]

Why am I interested in this topic? Because I have an exam I don't want to fail

[@datatab]

Then all the best : )

[@annawhyte5890]

That's me right now

[@samanthamakhafola3014]

Same here

[@gladysnakirijja431]

Funny

[@samiyaahmed9797]

😢 same we are

[@Happyticcer]

Thank you SOOOOO much for this fab video. Beautifully presented and clear diction throughout... Perfect for my revision.

[@mueslimjamm2202]

Super easy to follow! Thank you for helping me to find my way in the jungle of statistics :)

[@mulugetabuche6128]

wow, what kind of presentation this is, I'm satisfied

[@constantinifrim1184]

Hello! How to apply the non-parametric u-mann-whitney test for two samples EE:5,7,6,9,8,7,10,4,3,6,7,8 and EC:4,8,5,7,10 ,10,3,4,7,9 ? (values ​​represent marks obtained) Thank you!

[@nadiyatariq1822]

Best thing I came across today .... Awesome explanation

[@juranmezka8631]

Such a useful dear ma'am.. May God Bless You!

[@banajitdeka3109]

I am glad to found your videos'...Thank you some much

[@SohaFayadGanama]

MANY THANKS IT WAS SO HELPFUL

[@tsegayewedajo949]

This is very critical subject in statistical techniques applicable in research. Mostly I was confused in such a way that they are talking about qualitative and quantitative research.

[@saadiachaudary2401]

Qualitative data is in quantitative research. Qualitative research is totally different where coding is done that does not deal with mean medians

[@nishantshade668]

This was a really nice and informative video. But I do have a question. Under what category (Parametric or Non Parametric) will tests like Wald test and Likelihood Test come??

[@datatab]

Hello, thank you for your feedback! I'm not 100% sure and would have to research it myself first, but I think both are not parametric! But as I said, better check again yourself!

[@manikantareddy1830]

Link for your video on dependent and independent variables???

[@sahifasultana5800]

Nicely explained!! Lots of love from India

[@datatab]

Glad you liked it!

[@maheerasyed9754]

Can you explain why nominal measurements use nonparametric?

[@andres18m]

Remember that these are only assumptions, It is not required normally distributions in order to use parametric tests. Usually these tests are very robust (e.g., ANOVA), and will probably have the same results.

[@datatab]

Yes that's right of course! Many thanks for the feddback! Regads Hannah

[@sandygamage1586]

the data set was non parametric and I did spearman correlation for that...and I want to know what test should I do for regression analysis...is there separate rate test for non parametric data

[@sonitclef8675]

What did you end up doing?

[@dillipmeher]

Very nice explanation

[@icarelasuth4211]

Thanks...Very helpful.

[@datatab]

Thanks for your feedback! Regards Hannah

[@kw9158]

Why is the t-test, chi2-test, anova function no longer available? Just looking today, and it's no longer a test that you can use.

[@arturleperoke3205]

Hey @DATAtab, I think parametric test like the t-test/Anova do not care about the distribution of the population data or the sample data -> it is important that the sample means should follow a normal distribution. Also parametric tests like simple regression /multiple regression only care about the distribution of the error-term following a normal distribution, so again not that the population or samples follow a normal distribution

[@datatab]

Hi, many thanks for your feedback! hmmm, if the sample data is normally distributed, isn't the mean also normally distributed? Since one draws usually only one sample, and thus there is only one mean value, one cannot examine in practice in any case whether the mean values are normally distributed, but only whether the data are normally distributed! Please correct me if I am wrong! Regards, mathias

[@arturleperoke3205]

​@@datatab Hi Mathias, it is not my place to correct you or your team, but many thanks for reacting to my concerns!! I know that you often find the assumption in statistic-books that normality (or near normality) of the population data is a precondition for t-test´s and ANOVA´s. But when I was younger I learned that with a big enough sample size the CLT gives us a normal distribution of the sample means regardless of the sample data distribution or of the population data distribution. And that seemed to be the fantastic magic of the CLT: since we often do not know the complete population (and its distribution) we can rely on the CLT to give us a normal distribution of the sample means to perform test´s and give Confidence Intervals for the means etc. Also there exist t-test´s for binomial data and the distribution shape of binomial data is certainly not normally distributed. This is a rather naive question from my side but because of what I wrote above: why than bother with non-parametric tests at all? The only reason that comes to my mind is "whenever I have veeery small samples and no knowledge of the population distribution"

[@arturleperoke3205]

@@datatab did you mayhap have had time to talk to collegues about question (why to bother with nonparametric tests at all when the CLT (+ robust sample size) seems work "magic" regardless of the underlying population or sample distribution). Also, If I have been unclear in what I meant, I found a video with Dr. Todd Daniel that more visually describes what I meant about the CLT and sample mean distribution (or any other sample parameter-of-interest distribution). kzbin.info/www/bejne/fZTJiqxobNN1nbs

[@nielalfredtorrero8046]

Thank you

[@siddharthvm8262]

Thank you 👍

[@datatab]

Thanks for your Feedback!!! Regards Hannah

[@charmaine7301]

Chi square can be used for non parametric tests right?

[@datatab]

Yes : ) Regards Hannah

[@naoremanand]

If one sample is normally distributed and another not normally distributed which correlation i have to use?

[@datatab]

Spearman, because one sample is not normal and thus are the assumptions for pearson not met.

[@johnyrusoc]

So helpful videos!

[@datatab]

Glad you like them! Regards Hannah

[@scramah195]

Could you please clarify 1:55 through 2:17? Why would a small sample size and/or a small salary difference lead one to reject the null hypothesis?

[@sonitclef8675]

I'm also struggling to understand this too. It sounds contradicting, so maybe I'm thinking about it wrong 🤔 😕

[@sonitclef8675]

I think that's because EVEN though it's only a small difference and a small sample size with doing a parametric test it'd enough to reject the null hypothesis???

[@fatemehsh1391]

Thank you very much

[@datatab]

Many thanks!!! 😊 Regards, Hannah

[@koushikmondal9574]

Thank you 🎉

[@datatab]

You’re welcome 😊

[@gladyskyambadde9976]

so helpful

[@datatab]

Glad it was helpful! Regards Hannah

[@karishmasingh3737]

How do we come to know that data is normally distributed

[@datatab]

Please have a look here: datatab.net/tutorial/test-of-normality

[@nikhilmadiwal5444]

Normality test need to be done

[@namratajain921]

Simply explained 👍

[@datatab]

Thanks : ) Hannah

[@namratajain921]

@@datatab My name's Namrata not Hannah. It's okay though

[@datatab]

@@namratajain921 : ) But my name is Hannah : ) it was like "Thanks, Regards Hannah"

[@namratajain921]

@@datatab 😂hahahaha, I'm sorry bro ❤️

[@lilac624]

Are 30 respondents enough for parametric tests?

[@datatab]

Hi, the Central Limit Theorem suggests that with a sufficiently large sample size, the sampling distribution of the mean approaches a normal distribution, regardless of the distribution of the population. Typically, sample sizes of 30 or more are often considered adequate for the central limit theorem to hold, which can justify the use of parametric tests. However, this is a general guideline and might not apply in all situations, especially if the data are heavily skewed or have outliers. Regards Hannah

[@kowtharhassan882]

Are non parametric data guantitative?

[@datatab]

Yes!!! The distribution of the data is just not normal!

[@jann9507]

3:00 table of tests

[@deepaksharma-je2rx]

How can I contact to you

[@datatab]

How can I help you? Regarding advice I have currently unfortunately no time!

[@user-qf3mj8or6b]

Watch your wideo about it?

[@originalvonster]

1:30 parametric tests are more powerful

[@pavankumarmothukuri2227]

For my todays exam

[@momenr.salama9523]

She really sounds like killjoy from valorant, I think I'm in love.

[@datatab]

😃

[@Hansika_Putri_98]

😂

[@kanaadabhat3240]

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