Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Supported by

"flag significant comparisons" option in the PostHoc section - can we trust it?(JASP)

Hello guys,

I was wondering if after performing ANOVA in JASP, I can actually rely on the "flag significant comparisons" option in the PostHoc section or I need to manually adjust to my new adjusted p-value?

For example (image + data attached): I performed a behavioural test helping me to divide participants into 3 groups (controls, abnormal and normal). Then, I wanted to check their brain atrophy level as based on this division.

ANOVA is significant (p = 0.046), so I performed a PostHoc (I chose Bonferroni). There are 3 comparisons to make as I have 3 sub-groups of participants, so the new adjusted p-value for Bonferroni is = 0.05/3 = 0.016666 (this one is just manually calculated as I don't see it in JASP).

However, I chose the option "flag significant comparisons" and there is a Bonferroni result p = 0.048 which is indicated by JASP as significant. Still, if I make the above calculation manually where I got the new adjusted p = 0.016666, then this result of p = 0.048 should not actually be indicated as statistically significant.

Still, there is this beautiful note:"P-value adjusted for comparing for a family of 3"

So, is JASP somehow taking the new adjusted p -value and calculating it in a manner that is easy for us to understand and adjusting it to the initial alpha of 0.05 OR "the flag significant comparisons" has another meaning and we should not trust it , but unfortunately manually calculate the new adjusted p-value and make a case by case individual decisions?

Thank you and best wishes!

Comments

  • Hi @autumn_moments5648 ,

    The Bonferroni adjustment can either be an adjustment to the alpha that is used for deciding on statistical significance (e.g., 0.05 / 3 = 0.016666), or you can adjust the observed p-values themselves by multiplying them by the number of comparisons and then compare them to the initial alpha (e.g., 0.05).

    JASP takes the latter approach (as most other statistics software do, because then you can use any alpha value), so the p-values you see are already adjusted by the Bonferroni method (hence the subscript in the column name, and the footnote in the table). So for instance, the p-value you see would be 0.048 / 3 = 0.016 unadjusted.

    The flag option then puts an asterisk next to all adjusted p-values < 0.05. I hope this clarifies the issue, please let me know if you have any further questions.

    Kind regards,

    Johnny

  • edited November 8

    Thank you so much, Johnny! That was really helpful. Now, I know I can trust Jasp calculations for multiple comparisons.

    kind regards and thanks again!

Sign In or Register to comment.

agen judi bola , sportbook, casino, togel, number game, singapore, tangkas, basket, slot, poker, dominoqq, agen bola. Semua permainan bisa dimainkan hanya dengan 1 ID. minimal deposit 50.000 ,- bonus cashback hingga 10% , diskon togel hingga 66% bisa bermain di android dan IOS kapanpun dan dimana pun. poker , bandarq , aduq, domino qq , dominobet. Semua permainan bisa dimainkan hanya dengan 1 ID. minimal deposit 10.000 ,- bonus turnover 0.5% dan bonus referral 20%. Bonus - bonus yang dihadirkan bisa terbilang cukup tinggi dan memuaskan, anda hanya perlu memasang pada situs yang memberikan bursa pasaran terbaik yaitu http://45.77.173.118/ Bola168. Situs penyedia segala jenis permainan poker online kini semakin banyak ditemukan di Internet, salah satunya TahunQQ merupakan situs Agen Judi Domino66 Dan BandarQ Terpercaya yang mampu memberikan banyak provit bagi bettornya. Permainan Yang Di Sediakan Dewi365 Juga sangat banyak Dan menarik dan Peluang untuk memenangkan Taruhan Judi online ini juga sangat mudah . Mainkan Segera Taruhan Sportbook anda bersama Agen Judi Bola Bersama Dewi365 Kemenangan Anda Berapa pun akan Terbayarkan. Tersedia 9 macam permainan seru yang bisa kamu mainkan hanya di dalam 1 ID saja. Permainan seru yang tersedia seperti Poker, Domino QQ Dan juga BandarQ Online. Semuanya tersedia lengkap hanya di ABGQQ. Situs ABGQQ sangat mudah dimenangkan, kamu juga akan mendapatkan mega bonus dan setiap pemain berhak mendapatkan cashback mingguan. ABGQQ juga telah diakui sebagai Bandar Domino Online yang menjamin sistem FAIR PLAY disetiap permainan yang bisa dimainkan dengan deposit minimal hanya Rp.25.000. DEWI365 adalah Bandar Judi Bola Terpercaya & resmi dan terpercaya di indonesia. Situs judi bola ini menyediakan fasilitas bagi anda untuk dapat bermain memainkan permainan judi bola. Didalam situs ini memiliki berbagai permainan taruhan bola terlengkap seperti Sbobet, yang membuat DEWI365 menjadi situs judi bola terbaik dan terpercaya di Indonesia. Tentunya sebagai situs yang bertugas sebagai Bandar Poker Online pastinya akan berusaha untuk menjaga semua informasi dan keamanan yang terdapat di POKERQQ13. Kotakqq adalah situs Judi Poker Online Terpercayayang menyediakan 9 jenis permainan sakong online, dominoqq, domino99, bandarq, bandar ceme, aduq, poker online, bandar poker, balak66, perang baccarat, dan capsa susun. Dengan minimal deposit withdraw 15.000 Anda sudah bisa memainkan semua permaina pkv games di situs kami. Jackpot besar,Win rate tinggi, Fair play, PKV Games