For a project I’m analyzing data in R with two non-proportional hazards model: an Aalen model and a Cox-Aalen model, of the library timereg, such as: fit_aalen = aalen(Surv(Survival, Status) ~ v1 + const(v2), dati) fit_coxaalen = cox.aalen(Surv(Survival, Status) ~ v1 + prop(v2), dati) The problem is that for both I CAN’T PLOT THE ESTIMATED SURVIVAL FUNCTION, if I type “plot(fit_aalen)” it only shows me the plot of the cumulated coefficients, I need the estimated survival function... Please help! Can’t plot the estimated survival function for two models ..read more

Hello, I attempted to detect outliers before performing regression analysis. Initially, I used Cook's distance with the rule that any value less than 1 is not considered an outlier. Surprisingly, this approach did not identify any outliers in my data. However, when I employed the interquartile range method, I detected 20 outliers. Now I am unsure which method to rely on. Upon further analysis, I noticed that the end results of the regression analysis remained unchanged. The significance of... Outliers detection for Psychologie student ..read more

Hello, I attempted to detect outliers before performing regression analysis. Initially, I used Cook's distance with the rule that any value less than 1 is not considered an outlier. Surprisingly, this approach did not identify any outliers in my data. However, when I employed the interquartile range method, I detected 20 outliers. Now I am unsure which method to rely on. Upon further analysis, I noticed that the end results of the regression analysis remained unchanged. The significance of... Outliers detection ..read more

I utilized the crosstab function to obtain OR in SPSS v.29; however, the result it calculated did not equate with the data at hand. I ran it through excel and got a completely different OR. As an example, in SPSS, for one of a few sets of data I was recently analyzing it gave me an OR of .117, but when I calculated the OR using Excel my OR was 8.53. Does anyone have an insight as to why these numbers are not matching ..read more

Hello, I'm quite new to stats and my undergrad was years ago, can you help please?! I want to compare two groups (A and B) to see if an intervention has a significant effect on outcomes. Group A will have about 36 participants, Group B about 28. There is no control group. A and B will be doing subtley different interventions. All participants will do 8 measures each before and after the intervention. I'd like to test if the intervention improves outcomes on these 8 measures, and to see... Which statistical test? Two dependant variables and 8 indep ..read more

Hi All, Apologies if my question is similar to my earlier post. I need assistance to review the final statistical analysis and determine if my answer to the research questions are correct. The report of the analysis to answer the two research questions is attached. I appreciate your time and help. RQ 1. To what extent did the number of Individuals impacted by a data breach related to the healthcare entity type? Hypotheses H01. The type of healthcare entity type and the number of... Help Reviewing Statistical Analysis Report ..read more

Hi All, I want to know how to appropriately conduct post-hoc analyses on a two-way ANOVA. I have provided a scenario below. Let's say I have 3 groups (1,2,3) containing 10 participants each and they are being assessed over 3 time points (a,b,c). I find no interaction effect so I will examine the main effects. Now let's say I find a main effect of time, when conducting my post-hoc analyses to see where the significant change was over time, do I have to conduct this post-hoc analysis on the... How to conduct appropriate post-hoc of two-way ANOVA ..read more

How do I calculate power for a serial multiple mediation? I am using the Hayes Process macro, model 6 and will be using bootstrapping (5000 ..read more

Dear All, I have a population of 2975 cases. How do I determine the sample size? Thank you in advance for your help ..read more

Hello everyone! I have Xi ~ B(mi, p) and for a percentage p, these two estimators: T1(x) and T2(x). I am trying to find which of the estimators is better using the Mean Square Error. In the first picture you can see the formulas of T1(x) and T2(x). I am at a point where I have already calculated E[T1(x)] and E[T2(x)] and I have found that they are both equal to p. Now I need to compare the MSE of each one and see which has... Statistics. Question while calculating Mean Square Error ..read more