- The paper is essentially all 1) math, 2) my logic otherwise and 3) a couple of claims about scientific opinion (that, from my searches, no scientist has written directly about).

- Consequently, I'd like someone who knows what they're doing, re Bayesian statistics, to tell me if, and where, I've gone...

Immortality & Bayesian Statistics]]>

I have a question where the sample is n=25, However, the question provides the population mean and the standard deviation.

After several hypothesis questions, part b asks:

Your test in part (a) required two important assumptions in addition to the assumption that the value of is known.

What are they?

I stated:

1 – That a random sample is selected from the target population.

2 – That the distribution of the population is approximately normal. If N>-30, due to the CLT this...

Hypothesis Testing - Which Condition is More Important]]>

I am currently doing my Master's thesis in Public Policy, focusing on quantitative methods. What I currently want to research for my thesis is the role of social insurance programs on human capital development. How I want to operationalize that is by looking at how in the United States the Children's Health Insurance Program (CHIP) has affected educational outcomes like test scores on a state level. I wanted to analyze panel data on a county level for...

Question About Simultaneity Bias/Causality in Panel Regression for Master's Thesis]]>

I am currently doing my Master's thesis in Public Policy, focusing on quantitative methods. What I currently want to research for my thesis is the role of social insurance programs on human capital development. How I want to operationalize that is by looking at how in the United States the Children's Health Insurance Program (CHIP) has affected educational outcomes like test scores on a state level. I wanted to analyze panel data on a county level for...

Question About Simultaneity Bias/Causality for Master's Thesis]]>

t-test on ancient sacrificial victims' bones: which one?]]>

How to deal with individual pseudoreplication?]]>

I raised concerns about that, but I am not sure myself. I know the theory behind violations of the assumptions such as the Gauss...

How serious are violations of regression assumptions]]>

I have a neighbor who works from home and drives in and out...

Probabilities of two people driving past each other simultaneously]]>

I'm currently an undergraduate student trying to find validity and reliability of questionnaires. I have performed equivalence testing between the questionnaires for validity, test retest for reliability, and also have done Pearson correlations to identify any relationship.

I was told I should also do paired sample t tests between the different questionnaires. Although I don't understand why because this finds the significant difference when I am trying to find that the...

Questionnaire Testing]]>

For example, if I have a classification, I know to not use regression, but I have choices of trees, vector machines, KNN, Naive bayes, etc...

How to know which ML algorithm to choose]]>

I need some help restructuring my data in SPSS. Usually in the raw data each variable/coloumn is a different question, however the system I am using is giving me output the opposite way. Var 1 = all questions in the survey. Var 2 = all answers in the survey. Var 3 and 4 are Store and City # and Var 6 is the actual primary key for each respondent.

How do I get it so that all questions in Var 1 become new columns/variables and the answers go along with them for variables 2,3,4,5...

Restructuring data: Put each case on a row]]>

I am fairly new to this forum and also new to statistics in general. I learned a little about probabilities, statistics, anova, regression but i don't really understand how to apply them to determine the correlation between the last year advertising effects and current year sales performance. Let me give you more details on what i want to study:

So, i have an ecommerce website that is 7 years old and we used google/cpc as advertising method since begin.

I want to...

Determine impact of historical data on current data]]>

NEED HELP! Cluster Sampling / Cluster Analysis.]]>

So:

- The data samples are labeled in 4 categories...

Statistical Validation of a Labelling Method]]>

I applied a Canonical Correlation Analysis and it seemed all the variables in X with 3 in Y were correlated.

I also did a Kendall's test for each pair of variables (X,Y). I found out the same results. But i don't know what to do after doing all of that to proove there's a correlation bewteen X and Y.

Thanks ]]>

I’ve been playing blackjack from some time and just received a 100% bonus.

For those of you who are not familiar. If you receive a 100% bonus this means if you deposit 200 $ then you gen 200$ bonus.

So you start playing with 400 $. You have a playthrough, an amount of $ you have to play before you can withdraw the money.

The bonus I received was for 500 $ so you start with 1000$ and need to play for 45000 $.

I made a model. Basically I generated a random number between 0 and 1.

If the...

Blackjack simulations]]>

Suppose I want to compare algorithm runtime performance (measured in seconds) of different algorithms for the same problem type. There are several problem instances for this problem type on which the algorithms are tested and performance is measured.

As far as I know, the following is true (please correct me if not!):

- We want to compare 2 algorithms on 30 independent test instances: In this case, one could use a unpaired Student's...

Test wanted for comparing algorithms]]>

The problem can be outlined as below where a sample can be split into a number of categories (A,B,C,D) :

Proportions from Sample 1 Proportions from Sample 2

A..............................X...................................................................X

B [COLOR=rgb(239, 239...

[URL='http://www.talkstats.com/threads/advice-please-statistical-testing-a-number-of-proportions-from-two-samples.71327/']Advice please: statistical testing a number of proportions from two samples[/URL]]]>

categorical control variables in SEM using AMOS]]>

Essentially it’s a clinical trial where we gave patients a dye and checked for it’s presence in the abdomen using a fluorescence camera (intervention) and a plain white light camera (control). We have a binary outcome (present or not) as well as signal intensity (continuous variable) for the intervention data.

I want to see whether the fluorescent dye was superior to the control and what the probability is

Over time that the dye is better than the...

Which test to use]]>

But do I need to be careful with ratio data because this essentially treats two related variables (golgi size and cell size) as a single variable. Are there more...

Ratio of sizes data]]>

I am trying to determine what statistical measure of association I can use to determine whether there is a relationship between these two variables.

I assumed the best way to do this is to convert the two variables to percentages so that my hypothesis would be: there is a positive correlation between the percentage of...

Can you use correlation for percentages?]]>

First of all, thank you for taking the time to read this and hopefully provide me with an answer. Context: I'm an MD, currently in my third year of my PhD in adult oncology.

I'm doing a study regarding treatment-related mortality. In this study, we have roughly 2000 patients included (5-year cohort) , all adults with cancer. In this population we want to look at factors that increase the chance of treatment-related mortality. I've done previous studies looking at overall...

Which competing risks survival analysis to choose]]>

I write to ask an advice about which type of analysis I should perform in the following situation.

I have 2 groups:

- treatment group
- placebo group

- session 1 (pre-treatment)
- session 2 (post-treatment)

- dependent variable
- mediator1
- mediator2
- mediator3

mediation in a mixed repeated-measures design]]>

We are conducting a finance event study on abnormal returns and unexpected trading volume.

Our data consists of abnormal returns/volume (not normally distributed, leptokurtic, log transformation not enough) for an industry index security for 250 consecutive trading days for estimation period, and the following 250 consecutive trading days out-of-sample, in which we have three sets of 5 days of event periods.

We would like to test each of these days in each event period...

Finance event study on abnormal returns for one security - non parametric test needed]]>

I am wirting my thesis and I would like to test the effects of an mindfulness Intervention (independent variable) on reducing depressive, anxiety and stress symptoms (3 dependent variables). I have a pre and post-test for this and I would also like to include a control group.

Which test do I have to use for this and how can I calculate my power to knwo how much particpants I have to include for this study?

Thank you in advance

Kind regards,

Naomi]]>

Examining the moderating effects of negative affect on Perfectionist Self Presentation and social media addiction

I’m thinking I got my moderator wrong. It should actually be Perfectionist Self Presentation that would moderate the relationship between negative affect and social...

Does this make sense]]>

(1,0,0) for 3 rows

(1,1,0) for 3 rows

(1,0,1) for 3 rows

I guess you could say I need help learning rep( ) in the matrix function. Thanks for your help.]]>

Thanks in advance ]]>

I have searched a few and saw different types of table preparation for multilevel logistic regression analysis.

As a new thesis student, I am getting confused. Now, How can I create a table with multilevel logistic regression model with these 3 level variables?

Level 1: Participant level : child_age, breastfeeding, vita_a, vaccination, nutritious_food,

mom_age, education, workstatus, hus_edu

Level 2: Household level : wealthindex...

Interpreting a 3 level multilevel logistic regression model]]>

I am currently using BDHS 2014 dataset.

I want to execute a 3 level multilevel logistic regression model by using 'gllamm' command.

Here is the leveling:

Level 1: Participant level : child_age, breastfeeding, vita_a, vaccination, nutritious_food,

mom_age, education, workstatus, age_frst_brth,

Level 2: Household level : wealthindex, med_exposure, toilet_fac, fam_membrs, dec_childcare, dec_momcare

Level 3: Community level : residence...

gllamm command for 3 level multilevel logistic regression model]]>

I am very new with statistics and I am looking for some advice and ideas.

I found a lot of information in Google, but some times too technical or some times not sure if useful in my case, so I was hoping someone can give me some light.

I have conducted a survey to understand the quality of the documentation that I create for my clients. I have sent to my full list of clients (170) and I only got 13 responses, all of them completed 100 de survey.

In the survey there are three...

Survey results analysis]]>

I'm currently conducting a study looking at the relationship between sleep, stress and fatigue in a student population. I'm unable to conduct correlation type analysis with this study. I know that some form of regression analysis would be best to investigate these relationships, however, am finding it difficult to single out which type as each factor affects the other. Would running multiple linear regression analysis be appropriate in this case?

Any help would be hugely...

which type of regression analysis to use]]>

I'm trying to come up w/ a way to predict coupon mix. I know 100% of my customers will take a coupon, but I want to predict the mix of types of coupons customers will take. I can't use regression analysis... does anyone have any suggestions?

Thank you!]]>

The big issue is that as per my theory tested I am not interested at all in the main effects of demographics but only in the interactions with the condition variable. Moreover, there are extreme collinearity forces among the demographics e.g. income and education etc.

Hence, I...

Logistic Regression Models Without Main Effects?]]>

I think that for the above, isn't the AIC, BIC the most arguable? I would look at autocorrelation plots, but I am trying to see what is missing in this and how to handle on the multiple models. Please elaborate with details, and thanks]]>

solve some challenges I have came accross in my job.]]>

Just a thought, but could...

Limitation of Insurance Liability]]>

If you're interested in a Quant Psych PhD, but you're not particular about what area you study within it, what specific Quant Psych areas would make you most employable

So for example, is there a certain kind of analysis (e.g., multilevel modeling) that is currently in very high demand in industry/government?

Or is there a certain area of application (eg, genomics) that is currently in very high demand in industry/government?

As examples here are some...

What area of Quant Psych most lucrative / best prospects for PhDs?]]>

I’m running a surveylogistic procedure with complex sampling variables (stratification, cluster, and weight) to account for sample size in my estimates. Everything is suspiciously significant. Suspicious because when I run the model on a single year some...

Sample Size Affecting my Estimates]]>

I conducted a survey where respondents need to evaluate different combinations of firms and need to decide how attractive they are to them. My survey includes different factors with different levels. I already generated the orthogonal design and got 18 cases. However, I did not tick the option of holdout cases because I would have too many combinations for my participants. Does my survey lose credibility because of that?

Each of the 18 Company combinations is ranked INDIVIDUALLY...

Need help with SPSS CONJOINT ANAYLSIS]]>

I am a Master student and just finished collecting data for a survey, a vignette study. I have a total of 12 vignettes, followed by 4 question (the same questions after each vignette), which measure Preference on a 5-point Likert scale. Each participant was randomly shown 3 vignettes. The vignettes are composed out of two variables: Type of Task (4 different task types) and Urgency (perception of low, high, or no urgency). Hence, 4 x 3 = 12 vignettes.

Unfortunatly, I have no...

How to analyze a Vignette study in SPSS]]>

Hi,

I am a PHD student and just finished data collection for my third study, which was a vignette study. I designed an online questionnaire with 30 different scenario's, or vignettes, followed by a block of 7 questions (the same questions after each vignette). Each participant was randomly exposed to 5 vignettes, out of the total of 30. The vignettes are composed of two variables: a topic (ranging from low to high in intimacy, 5 topics) and social tie...

How to organize vignette data in SPSS]]>