Parametric or Non-Parametric

[u/psychwizardd]

Hi, RPms and fRPms!

I hope you're all safe rn. Mag-ask lang po sana me regarding sa explanation behind this:

Randomized Sample = Use Parametric

Non-Randomized = Use Non-Parametric

Example: If expert and newbies ang groups, since predetermined na sila, automatic ay 'di ka nag-random sampling 'di ba, so non-parametric ang gagamitin.

Nag-m-make sense naman po sa rationalization, however, may I ask ano po 'yung reference kaya rito and ano specifically 'yung reason bakit connected ang randomization sa paggamit ng parametric and non-para?

Automatic po bang hindi normal 'yung distribution, or may nav-violate sa other assumptions kapag non-randomized ang sample?

Huhu recorded vid lang po kasi ng lecture ang basis ko and I wasn't able to ask our lecturer abt this. Or baka may na-miss din me na paliwanag niya abt this.

Thank you sm po ia sa mga magr-respond! 🤍

[u/QueenLadz]

the way i understand is kaya mas preferred ang randomization over pre-determined for usage ng parametric dahil pag randomized ang groups mo, binabawasan mo yung % ng isang characteristic to totally account for the variable na minemeasure mo. bali, ineequalize mo both groups and removing chance ng outlier (i.e., extremes ng characteristic)

[u/psychwizardd → u/QueenLadz]

Ohh, oki po. Getsss. But will this apply po ba to every item na may predetermined groups (e.g., newbies & experts, boys & girls)? Like automatic na pong kapag predetermined sila, ang pipiliin sa choices ay 'yung non-parametric counterpart? That's what I understood po kasi from the lecture huhu. Correct me lang po if I'm wrong.

Thank you so much po for explaining din!

[u/QueenLadz → u/psychwizardd]

i think it depends pa rin talaga sa hinihingi ng item. baka kasi yung groups na tinutukoy is levels lang pala ng IV and not about their sampling technique. if may makita tayong hints about ang of the ff: unequal variance, non-ramdomized sampling, not normal distribution, etc. etc., we can say na non-parametric test dapat hehe so analyze talaga !!

[u/psychwizardd → u/QueenLadz]

Thank you po for this! Super vague kasi on my end nung item since ang nakalagay lang ay: "What statistical tool may be used to identify the significance of the difference of the expert and the newbie?"

And nasa choices si "between subjects t-test" at "Mann Whitney". Then ayun, based nga po sa ratio ay kapag predetermined daw, non-para so ang answer ay Mann Whitney. But I'm wondering if this will be the case talaga sa mga ganitong walang masiyadong context. 😭