I have a B.S. in biology and I'm currently working as biologist. I am wanting to pursue a master's degree in statistics and there are several online programs that look intriguing. A couple of them are M.S. degrees and one (the one I like the best) is a M.A.S. All of them are applied statistics degrees. I'm not sure which one is better. I've read that the M.S. is more theoretical and is better if I pursue a phd. At this point in my life I don't plan on doing that.

Which is better, a...

M.S. vs M.A.S. in Applied Statistics for future career]]>

We have three decks of 52 cards, 4 suits of 13 cards. We shuffle them separately and separate each deck into two piles of 26 cards. Now ask someone to take a card from 4 of the 6 available piles, one per pile, and we see that 4 kings have come out. So let's take the 2 piles from which no cards have been drawn, put the 4 kings inside, and shuffle again. You now have 56 shuffled cards. Divide into 2 piles and take the...

Shuffle cards deck help- Pls]]>

Vericiguat in Patients with Heart Failure and Reduced Ejection Fraction (nejm.org)

In this paper Cox regression was used for time-to-event analysis and to calculate hazard ratio. My understanding of this method is the primary outcome is the variable and time is constant for the two treatment arms...

Cox regression time-to-event interpretation]]>

Article Link: https://onlinelibrary.wiley.com/doi/full/10.1111/bjd.16918

The statistical analysis procedure used in this study consists of an A priori and a paired T-test. The a priori analysis is a META analysis used to determine the minimum amount of time necessary to achieve a certain amount of statistical...

A priori use and paired t-tests]]>

I was wondering how to compare the difference between two variables measured within one group.

For instance, all subjects were asked how much they like oranges and then, how much they like apples.

Now, I want to know what fruit they like more.

It seems intuitive to use a paired t-test. However, we are not actually measuring the same variable here.

I thought about using some kind of multivariate test, but am not sure what or how to conduct it.

Can anyone help?]]>

i want to compare the test scores of the same sample of students before and after taking a course. Basically I want to test if the course has increased their knowledge. How can I do that?

Can someone please direct me to the right method? And the size sample?]]>

So, I need to do the t-test of values in the following situation:

1. There are two groups of patients, each following a different treatment.

2. For each group, there are 20 independent parameters analysed. For example, blood sugar, blood lipids, liver enzymes, and so on. These parameters are unrelated to each other then.

3. For each of the 20 parameters, there is a value at T0, T1, and T2. We are interested in the variation between T1 and T0, and the variation between T2 and T1...

T-Test values to use]]>

Bivariate Linear Regression Analyses]]>

My understanding of the primary result is the following: Survival probabilities were estimated with Kaplan-Meier curves, which had a log-rank hazard ratio of 1.01 (95% CI: 0.64, 1.83). Since the hazard ratio...

Interpreting Time-to-Event Analysis]]>

i'm in the middle of some data analysis but dont really know what test to use.

It should be a test where i compare the frequency made by a father to the frequency of 8 sons but also 1 father against 2 sons

Thanks in advance!]]>

natural sugar, and positively with protein and unsaturated fat.

Can any translate this. Thanks]]>

For a statistical course, I need to understand an applied statistical method in a research paper. I have selected a research paper regarding the effect of mRNA COVID-19 vaccines in pregnant females versus in non-pregnant females. They have applied Fisher Exact as a statistical test to compare the two groups for side effects of vaccines. After reading the paper, below is my understanding of how the Fisher Exact Statistical Test was used.

Study of a Statistical Method...]]>

I am studying immue cell distribution in different types of nontomourous (n=66), precancerous (n=67) and malignant tissues (n=48) in a single patient cohort. As you can see in the violin plot attached below, I started out by applying the K-W test to compare the distribution in the 3 groups (normal versus precancerous vs invasive) [p value seen on graph] and now I want to do a pairwise comparisions to find out where the difference actually relies.

if I tried both Dunn's post...

Kruskal-Wallis, Dunn's Test, Multiple Mann-Whitney-U Test]]>

I am currently working through the following paper. I'm trying to write out the proof for how they obtained equation 3.

I have attached a picture of my attempt.

(I am new to this discussion board and can't seem to figure out how to insert latex code. That is why I attached a picture of my proof instead of writing it out in latex)

Your help is greatly appreciated]]>

I know how to calculate a Wald value but am unsure about how to use the output to calculate significance. I want to calculate if there is significance between two test scores:

Score 1: 5.38 Standard Error: .81

Score 2: 4.12 Standard Error: .83

df=10

I know that the Wald value is 1.09. What do I apply that to for understanding if these two scores are significantly different.

Thank you very much!]]>

I need some help with the analysis part of my bachelor thesis.

To sum it up, I used the Ellsberg-Experiment (two urns, a certain amount of balls in both of them, one has the color distribution 50/50, the distribution of the other is unknown). I then asked people to fill out a Big 5 personality inventory. What I'm trying to determine is whether Big Five personality traits have an influence on whether people choose the urn with the unknown distribution of colors more...

How to sum up the results of multiple variables using the same experiment for correlation analysis?]]>

I was confused on my data in this few days.

I would like to compares the gene expression between "control and treatment"

Then, I have done the welch's t tests without followed by Bonferroni test because I think there are only two groups for comparison and alpha value is same even go through the Bonferroni test.

So, i would like to ask some suggestions from experts, is it correct about my thinking?

Thank you!]]>

I have a problem for a university assignment that two dummy variables are mutually exclusive.

The task is to estimate what can increase certain diseases in dogs using regression.

In the sample there are several factors (Lives in city yes/no, age, male/female etc....).

Then there is a variable owner, divided into male, female, couple.

For each of these, a dummy variable is to be created.

If I run the regression with couple and man, I get a coefficient of 0.0545 for man...

Two dummy variables are mutually exclusive]]>

First time poster at the end of their tether with their stats at the minute.

So, I'm working with a relatively large dataset (n=5,048) of survey respondents. I have split these respondents into three categories, A (n=2072), B (n=1056), C (n=1920), and want to compare the three.

I have created three numeric composite scores from my dataset, two of which are explanatory and one of which is the response variable, all based on current literature.

I want to complete two separate...

Which model?]]>

I am writing a project proposal: randomized, placebo-controlled crossover trial, I will be investigating treatment vs air. Participants will be asked to inhale the treatment or high-flow air (placebo). In this case, would a one-tailed test or a two-tailed test be more appropriate? Furthermore, the primary endpoint will be the time to onset of pain relief - which would be the best statistical tests?

My statistical competency is not so great. I, therefore, appreciate the help and do...

Stats help - please!]]>

Ive set the inputs as dependent variables but I do not what should I set for independent...

Setting variables, hypothesis and analysis]]>

Hey guys,

I want to find out if females (blue line) significantly are different from the men (red line). For "normaal gewicht" (normal weight) the confidence interval don't overlap, which indicates that they significantly are different (n=878). But for the other two groups (overweight (n= 138) and obesity (n= 29) the confidence intervals overlap. The intervals are bigger, because their n is smaller. My total n = 1045.

How can I do a...

How to compare groups within a group with a t-test?]]>

I would like to perform an interpretation of an entire regression output concerning a random-effects model.

But I don't know how to capture the information of the RSS [see the image below]. The information concerning the RSS is not displayed.

Thank you for your help.]]>

The overuse of percentages by our wise ruling class and media to convey critical information may be hindering understanding, and therefore a rational response to the

WANTED: Rational Coronavirus Analysis]]>

Does someone know how to proof this?]]>

Is there a quick way to get a matrix with the data from, say, (2, 5) to (15, 20) in a given data frame?

Cheers, kat]]>

I've run into a small issue that I'm unsure how to solve yet.

I did a repeated measures correlation in r (rmcorr) for a pre and post testing data of the same population. If I want to check if the correlations differ significantly from pre to post, I know I can run a fisher z to r test...but is it suitable for repeated measure correlations or just for Pearson's correlations?

To calculate fisher z to r I need the correlation coefficient and the sample size...but with a...

testing significance of two repeated measures correlations]]>

Can anyone explain to me what the exact formula behind this sample size calculator is?

https://www.danielsoper.com/statcalc/calculator.aspx?id=47

Thanks in advance!

Best regards,

Laura]]>

Background about my problem: I am trying to do a research project for my first statistics course. The project based on data that we collect from our class. I got lost on the internet while I was trying to learn to do proper hypothesis testing so I thought asking might be an option.

Data: The interview is about salary expectations after graduation. There are 100 total participants. mean of expected wage is 3192.00 dollars with a standard deviation of

1519.80 dollars. There...

Comparing male and female expectations which test shall I use ?]]>

I have to proof that the uncovered interest rate parity is hold if c_2(s)=E_1[c_2].

The two first order conditions are given as:

View attachment 3440

Then I simpliefied this:

View attachment 3441

View attachment 3443

I think, if the Cov-Term equals zero, the UIP is fullfilled. Could it be that the Cov-Term is zero, since our expectations of C_2 are the same as C_2 and thus, the variance of u'(C_2) equals to zero? Or is there another proof that the UIP is...

Uncovered interest rate parity]]>

Important note: I will do the processes below with ready functions/packages in tools, and I am not a professional statistician, so I would really appreciate if you can help with the question below with simplified explanation.

I have a dataset with a couple of features as "Product Risk Level" and "Customer Risk Score" and an outcome as "Customer Default" as below.

I want to calculate the significance or correlation of "Product Risk Level" and "Customer Risk Score" for the outcome...

Calculating t-test and correlation/importance of feature with aggregated dataset]]>

I'm doing a sequential linear regression. My dependent variabele has a range from 1 - 5. My independent variabele is a dummy. I found the following results:

Model 1: R-square = 0.0001 (contains only my dependent variable and two control variables)

Model 2: R-Square = 0.02 (contains the same variables as model 1 but I added 2 dummy's.) These two dummies are having ß = - 0.41 (P= 0.01) and ß -0.75 (p = 0.02).

So my question is:

The R-square is so low in model 2 (only 2% of the...

Small R-square, big slope, how is that possible?]]>

I want to compare three groups consisting of 4-5 populations each. The individual populations are represented by arithmetic mean taken from 30+ individuals.

The results of ANOVA confirmed significant difference between these three groups of populations. Still, there is only 4, 4, and 5 data for the groups, so I want to be sure.

Thx for the help.]]>

I am a newbie here in doing meta-analysis

In my study i have around 9 studies but weight of one study is like >95%,

So in this case what are my options? should i exclude that study?

ps. its a medical research with little data available.

thank you]]>

Could someone please help me get this sample size calculation right?

I would like to calculate the sample size for a randomized controlled trial.

Based on a systematic review, the effect of the primary outcome (insomnia severity) is expected to be Hedges's

The power should be 0.80, alpha is 0.05 (two-tailed).

I am expecting a drop-out rate of 25%.

I found this formula:

If I want to fill in this formula I am missing the standard...

Sample size calculation]]>

High X (85 items) + Low X (65 items) = X (150 items)

Both have unequal sample size, but they're from the same group "X." I opted for paired sample t-test, but the output results would only appear N=65 for both groups. I don't think I should run an independent t-test since "High X" and "Low X" technically aren't two unrelated groups since they...

Paired t test unequal sample sizes?]]>

Is there a website showing online Delaporte and Polya calculators? I am not referring to software to create and run the distributions

Thanks for any help !]]>

I ran an experiment where participants took a test of 16 questions, yes/no (binary).

They were tested at

Analayzed as subjects, their results for the test are higher at RI-7.

RI-7: 5.5

RI-28: 3.6

t-tests confirm that this difference is sig -

Analyzed as items, RI-7 scores are still higher.

RI-7: 515 incorrect - 269 correct

RI-28: 596 incorrect - 172 correct (more incorrect, fewer...

Estimated Means in GLMM put a group's score as sig higher, but it should be sig lower]]>

Including rates as predictor variables]]>

My script is as below:

`...`

How to adjust specific tabletext font to bold?]]>

"the exogenous variables may not be collinear with the dependent

variables, or their lags" How do I go about it? Thanks in advance.]]>

I have a question about estimating main hazard ratios in Cox models with interactions.

Weberian asked a slighltly similar question (Hazardratio statement, interaction in Proc Phreg (cox-regression)) but it does not answer this.

I am looking at the interactive effects of X according to Y on death. Here is the code:

proc phreg data=Mortality_M3_72 covs(aggregate);

class X(ref=first) Y(ref=first);

model (monthfrombl, monthfrombl_stop)*death(0)= X|Y /RL TIES=EFRON;

id...

How to estimate overall hazard ratio in interaction PHREG]]>

My independent variable is a dummy coding in which two groups are compared with each other. Expectations (t1-t0) were used as mediator and adherence behavior (t1-t0) as AV.

If I would proceed according to Baron and Kenny, it shows that there is neither a total effect nor a direct effect.

Likewise, there is no significant result from the condition on the mediator from t0 to t1.

However, the result between the mediator and the AV is highly significant...

Mediation analysis Conflict: Baron & Kenny vs. only indirect effect]]>

Does someone have an idea?

]]>

We are working on a stock and forex based trading algorithm. We are using statistical methods in our trading. We are already funded (but not live yet) so this is going to be a job from 1st day. We already have the idea. All of our team members will get a slice from the pie. This is a job "make happy, be happy!".

We are already invested so no need to look for an investor. What we need is great statisticians with desire and vision!

Please kindly contact me if you are interested...

Hiring statisticians for a long-term trading project]]>

I got two sets of sample, let us say flood affected data of two different districts in a certain span of time (years). How could I find which district is more affected than the other? Please see the problem attached]]>

For example, we have a goal of 75% of our referrals will be seen in 14 days. We had 5 referrals in May and only saw 3 of them in 14 days (60%). Our average is 4 referrals a month. When we look at our data...

% goals when your N is small]]>