The objective would be to find a representative value per m2, ie to find a formula to calculate the value of m2, which takes into account all the characteristics the information provided by the farmers of a city. This value would be used, for example, to calculate the price of the lands of those people who could not declare exactly the plants they possessed.

The information available is:

1) In a city with 1000 farmers, farmers have declared n...

Please, I need help on a measurement problem using statistics]]>

I am comparing a protein level in multiple (40 to 4000 depending on the analysis) brain areas across three diagnostic groups, with a couple of covariates. I am using ANCOVA to compare the three groups.

What is the best way to account for multiple comparisons?

Where I am conducting large numbers of ANOVAS (>50), FDR appears best. I have been running this on the LSD post hoc P values from ANOVA?

Multiple ANCOVAs: Post hoc Bonferroni, FDR, or can I use MANCOVA?]]>

I am doing a project on womens attitudes towards X.

I want to distribute questionnaires to women in the South West England region, and they must be aged between 18-44.

How do I find out my sample size? I used an online calculator which gave me 383 participants, but my supervisor said anything from 200-500 responses is low? What am I doing wrong?

I am unable to find out my sample size for this? I want confidence level of 95%, alpha 5%.]]>

R squared for linear mixed models]]>

I have to do an analysis for a transverse vs non-transverse patterning experiment that was structured in two continuous parts. There are 148 participants with a few outliers, and each TP and NTP were completed in 3 phases. A minimum of 14 correct answers were needed to proceed to the next part.

I’m contemplating discussing that it takes more attempts in completing TP tasks rather than NTP tasks. Perhaps even seeing if age affects attempt numbers.

Which SPSS analysis do I...

URGENT Help - Transverse vs Non-Transverse Analysis]]>

I want to thank you in advance for reading my post! ....and I hope my question is appropriate!

I am in a bit of a pickle!

I have been conducting a longitudinal study for my PhD. I followed children born 2010 and 2011 for three years collecting data on various symptoms, such as ADHD, externalizing behavior problems, emotion dysregulation etc. I started my data collection when the children where finishing their last year at preschool and ended my data collection when they...

What procedure would best fit my longitudinal data?]]>

I have 3 independent variables.

1. sex of participant

2. sex of stimuli (sex of pictorial stimuli in the experimental task)

3. level of anxiety

I have 2 dependent variables.

1. bias score (Response time)

2. accuracy (accuracy of responses in experimental task)

I would like to see the interactions and main effects of these variables, but I'm not sure which test to use.

Also, should I code the level of anxiety into two - anxious and nonanxious- using a cutoff score...

Which test to use?]]>

I have 3 independent variables.

1. sex of participant

2. sex of stimuli (sex of pictorial stimuli in the experimental task)

3. level of anxiety

I have 2 dependent variables.

1. bias score (Response time)

2. accuracy (accuracy of responses in experimental task)

I would like to see the interactions and main effects of these variables, but I'm not sure which test to use.

Also, should I code the level of anxiety into two - anxious and nonanxious- using a cutoff score...

Which test to use?]]>

I have got a question regarding the GDP. Is there a general result of how the variance and the expected value of a GDP distributed random variable x with expected value E(x) change if one would change the scale parameter and/or the shape parameter by constant

For example by result i mean something like: Assume we would multiply the scaleparameter by

Thanks a lot for your help in advance.]]>

I have a really difficult topic (for me its difficult, because im a newbie in R).

I want to optimize a function so i can make a matrix between two coordinate Systems (Lab and RGB).

Here is my code:

Code:

```
setwd("C:/Users/Tobi_Laptop/Documents/Tobi/Studium/6. Semester/Farbmetrik/Projekt/Umrechnung")
Messwerte <- read.csv2("Messwerterot.csv", sep=";", dec=",")
DeltaL_lin1_fun <- function(Lab_Werte, par){with(Lab_Werte, sum((Messwerte$L99o.soll -...
```

Null Hypothesis]]>

I am undertaking a project analysing insulin pump data in Type 1 diabetics. My dataset is from 2015-2019 and for each patient I calculate the mean or variance of many variables for the day. I then look at an average for the whole period 2015-2019 and am trying to determine behaviours associated with improved HbA1c, proportion of blood glucose readings "in range" (3.9-10) and proportion of readings which are hypoglycaemic (<3.0). The sample size is 556 patients. I am using R.

I have...

Multiple linear regression when unsure if independent variables are truly independent]]>

I am working on an animal epidemiology project; dead animals (samples) are opportunistically collected, then checked for the disease (positive/negative). Positive samples are restricted to one specific area but, as some areas provide more samples than others, I would like to check for biases in the sampling process (i.e. do I get more positives just because sampling was more intense on that area?)...Does anyone have any idea of which statistical analysis should I apply on my...

Non uniform sampling evaluation]]>

In the below example 1, (x=

I would expect the p-value of the two-tailed test to be 2* p(X≤

I understand that probability in the right tail is

So it seems that in R takes the value which is closer to

but still, don't feel it is correct to choose one of the discrete...

Binomial exact test - calculate p-value of two tailed test]]>

I am analysing a dataset in which there I have the following data of 50 participants:

Intervention: yes/no

T0: bacterial counts at T0 in cfu/ml (baseline value)

T12: bacterial counts at T12 in cfu/ml (after 12 months)

The data for bacterial counts are for Total bacterial counts (TBC), as well as for specific bacteria within the TBC.

I'm trying to find out the effect of the intervention after 12 months (is it effective?).

The TBC ranges from 0 cfu/ml (no bacteria...

Repeated-measures ANOVA? And how to achieve normality?]]>

This has been measured across 22 catchments. We want to be able to predict what insect diversity might be in a specific catchment.

It’s been quite a while since I did grad school and my stats are rusty.

What I have done is produce my own dumbed down version of multiple liner regression within a simple linear regression model. What matters to us are ecological realities, rather than a model that is...

Dumbed down multiple linear regression]]>

What I want to do:

1. Use a binary model, use different variables to predict 0 = Lose the game, 1= win the game.

2. Check the regression data the probit / logit and LS regression gives you.

3. Use them and get the probabilities for winning (=1) and losing (=0).

Here is my issue (and I think I got a lot more, unsolved yet as I don't know them actually).

I got the y=0...

Probit- and Logit for Winning Probabilities]]>

I need help understanding SPSS output for my marketing research final exam. I have attached a picture with what I want to understand.

I want to understand F score, sig value and t score, beta, mean and R2.

I would appreciate if someone can help me to do well on this exam. Thank you

Sasan]]>

I play a game called Maplestory. In this game, there are weapons. You can power up the weapons by enhancing them. The probabilities of success are different for enhancing from level 0 to 1, 1 to 2, so on and so forth. The probabilities are in the google sheets below.

Each enhancement has an associated cost to it.

Enhancement from level 10 onwards has a chance where the...

Computing Cost for a Probability Problem]]>

Again:

Why is it not possible to delete an account on this website? There was same question 10 years ago but nothing has changed. See here: http://www.talkstats.com/threads/how-do-i-delete-my-account-on-this-website.5691/

How do I delete my account? An answer in the link above says "Send a PM to moderators or Administrator." but I do not know who that is...

Fifth time: How to delete my account?]]>

I have two questions in regards to this data and possible confounds:

1) Within each condition participants differed on a variable say X (not the condition they were in) that had 3 possible values. What would be the best way to control for X to eliminate it...

How to analyze a categorical confounding variable for experimental results]]>

So I was wondering which test to use for my data I have data on trail length which is my dependant variable and I want to see if there is any significant difference between orientation (East, West, North and South). I have 4 plots that I want to test against one another to see if there is any difference. Can someone help me at trying to identify which test needs to be carried out. As I want to test if roads cause a barrier effect to animal movement and doing so by testing the orientation]]>

I have a date set (n=150) with 2 variables: contract value ($) and a binary variables success/failures that indicate whether the contract was completed without problems.

I want to know, for a given contract value, the probability of failure. I decided to create a basic histogram with my data and use a cumulative distribution function.

What do you think of that? I would like to use a simple solution.

Thanks!]]>

"“These considerations suggest arule of thumb. If the probabilities that you’re modeling are extreme—close to 0or 1—then you probably have to...

Linear Probability Models]]>

Please could you advise if the statistical method chosen to reach conclusions is correct ??? Please propose other if not

Thank you so much!!!

- Do 1)demographic characteristics of gender, 2age, 3)time working for company and 4)number of employees affect factors of Transformation to Digital Strategy, Digital Marketing...

Help with dissertation]]>

a. A statistical multivariate analysis and vertical distribution of concentration of pollutants for each river sediment sites (3 sites) and soil sites (2 sites).

b. produce variogram model for each showing the sill/correlation, nugget effect and range.

c. determine covariance if any and calculate T-test.

Anyone here should contact me on whatsapp +2348062556036]]>

I've really been struggling on the correct method to use to prove/disprove if my results are statistically significant. For the context in 2006/07, the UK tuition fees have changed from £1k to £3k and then again in 2012 to £9k. Attached is a text file of my collected data, it contains all the UK higher education institutions from 2000/01 till 2016/17 I need to show if there have been any statistically significant changes in total income and total expenditure in...

Help with stats work]]>

I was wondering how do I analyse if outliers are effecting my dataset? then a follow up question would be would I delete them if they are valid data and not just a fluke in the dataset?]]>

So I was wondering what is a correct stats test for percentages. So in my data set I have data such as vegetation that will equal up to 100% e.g. bush grass etc but I don't know how to do analysis my data as its the first time I ever done it with percentage. Any help would be greatly appreciated as I am stuck on this

(Update)

So this study is a small part of my overall study but I want to distinguish the vegetation abundance and type...

What is the correct statistical test for percentages?]]>

Y | X ~ HG(2n, 2X, n) SO;

Y ~ ???]]>

I have a question regarding the method I recently used to analyze my data. For some biological reasons we are interested in outliers (in contrast to most situations where we want to get rid of them).

Let's imagine we have the concentration of two proteins in several conditions (can be visualized in a scatter 2D plot where each axis shows the concentration of one of the proteins and dots depicts conditions). I basically compute Mahalanobis distance and then use Rosner's test to...

Outlier detection via Mahalanobis distance followed by Rosner's test (Generalized ESD test)]]>

Optimal lag length is 4 based on AIC and HQIC. Johansen test for cointegration then suggests 4 cointegrated equations in the model.

Running the VECM model, I get results as displayed in attachments...

Interpreting Vector Error Correction Model in STATA]]>

I work in a phytochemistry lab where substances are analysed by gas chromotography to estimate quantities of individual compounds in a sample. I want to work out how much variation there is in our process. To do so, I prepared three samples from the same source of tea tree oil, and injected each sample six times into the GC machine. Each injection was analysed for the quantity of 15 different compounds. So for each compound there are 18 measurements. I've calculated the mean and...

Confidence interval for single sample analysis]]>

I'm a student in biology, and I have a quite basic statistic question.

I need to compare the mean volume of a cellular structure in two groups (treated vs non treated), 5 subjects per group. I have hundreds of mesurements for each subject. Currently I'm just considering the mean for each subject, and I'm doing a t-test to compare the two groups, but I don't think it's the best way. Is there another test that I should consider ?

Enclosed is a set of factice data just to illustrate...

Which statistical test suits better for my datas ?]]>

I had a list of 48 genes that I mapped in 6 different tissues. I would like to know if there are differences in the number of genes found as present between the 6 different tissues. Do you think that a chi square would be appropriate? But then, how could I know between which tissues the differences are significant?

Thank you very much for your help!]]>

However, I am struggling to identify the correct reliability measure, because the 77...

Choosing an inter-rater reliability measure when different sets of raters score items?]]>

On the picture, the

Ordinal logit regression with ordinal dependent and independent variables]]>

Also, if one of the variables in the model is categorical, like income, classifying people into four income quartiles, what is the impact on power/precision etc. of increasing the number of categories of the variable (using quintiles instead of quartiles)?

Thanks!]]>

- Are newly diagnosed HIV+ personnel more likely to have an Meningoencephalitis (ME) diagnosis 2 years prior to HIV+ test than those who are HIV-?

When we pulled the data, we only had 2240...

Sample Size for Case-Control Study]]>

I would appreciate your advice.

I have the following experimental design: I measure the heartbeat of a person while he/she listens to music. The hypothesis is that the louder music will result in higher heartbeat rate. So, a subject listens for 30 min classical piece while measuring heart-beats. The data (both audio volume and heartbeat) is segmented into segments of 5 sec (360 segments in total). Within each segment I average volume and heart-beat rate. Now, I find 10% of segments...

Comparing two samples with not independent observations within each one]]>

I wanted to see if my data could be described better with a non-linear relationship. So I calculated a new Y' variable, based on the coefficients I got from the regression model. Just to make sure I didn't make any mistakes, I rerun the regression, with only the new Y' as the predictor. The results were the same. Then, I used the curve fit option in SPSS to look for a better relationship

However, when I try to do the same thing with an interaction variable, this doesn't seem...

Calculating the Y' variable]]>