My understanding on std. dev. is - if the data is away from mean by more than 2 std dev. we consider that as outlier.

Similarly for Median, we say that any data that is not in-between q1 and q3, we say again that as outlier.

So am confused which one to choose.

Can you guys help me understand.]]>

Questions:

Do demographic factors have an affect on how participatory ones views are on research design. Do these factors affect how participatory their views are, and how much they agree with given statements.

Does level of exposure to certain types of course content affect how participatory their views are, and how much they agree with given statements.

Nature of...

Which test to use, ANOVA, T-test, other? Urgent]]>

I have 9 samples of rainfall data, which all are average of time periods (columns) at given station (rows). Samples are all equal in number of variables. My question is - how to test, if any one of those 9 samples are statistically significant?]]>

''Conduct a test to determine if on average there are more pieces produced on a day when products of type A are produced than on a day when product type D is produced. Write down the value of the test statistic and the conclusion of the test. Also conduct a test to conclude if on average there are more pieces produced when the manager is present than on a day when the manager is not present. Again write down the value of...

Not sure what test to use- HELP]]>

I have to design a study for my research methods class. My quantitative question is: how does gambling disorder in males impact marriage satisfaction? So I believe my independent variable is gambling disorder (dichotomous, right? Either you qualify or not depending on DSM criteria) and the dependent variable is marriage satisfaction (continuous? based on a marital satisfaction questionnaire). I would love some comfirmation on those points. My big question is what kind of analysis can...

Which test? Urgent homework help, please!]]>

The method i'm using is checking for duplicate series depending on the length of the number entered.

The series i'm checking for are the 2 digits, 3, 4, 5, 6 and 7. Beyond that it get's pretty ridiculous.

What I come up with so far:

when entering a number of 100 digits length. Len = 100

when counting 2 digits duplicates, there is the range of [00 ~ 99] which are 100 items.

in a Len 100...

finding maximums when checking for duplicate random number patterns]]>

I am working on a project where I have three theoretical constructs and have binary coding for positives and negatives of each (attached is a snapshot of my data, but total N=159 and age ranges from 5-19). Couple questions:

1. How can I test this data for normality? To know if I should use parametric or non-parametric tests?

2. What test should I use to compare each construct (columns E-J) across age, gender, and location? And on whether or not they know a scientists (last column)...

Normality and tests]]>

Last couple of days I have attempted to re-educate myself on some of the concepts of statistics that I have long forgotten in the hope that I could reach a level of comprehension sufficient enough to model the relationships between variables and apply the formulas to economic forecasting. After a couple of days I feel overwhelmed by it all. I'm wondering if someone here can help me with lagged variables and how to compute the correlation using a program like R or Gretl. For example...

Beginner looking for help regarding lagged variables]]>

When I try, it comes out to say

Warnings

“the independent samples table is not produced.”

Group Statistics

*give nothing, but zeros*

under the box it says

“a. t cannot be computed because at least one of the groups is empty”

the teacher wont show me how to fix it, other students cannot figure it out. the data table is worth 400 points, please help.]]>

I expect predictor A to negatively predict my dependent variable, and predictor B to positively predict the dependent variable. Can I include both predictors in a (linear) multiple regression model even though the variables are associated to the dependend variable in different "directions"?

Thank you in advance and apologies for my English.]]>

Creating new variable based on Vales of old variable]]>

Help with Combining Variables]]>

It would help if you can not readily do multilevel modeling with a 4 point DV to know what can analyze this. I am testing the result of area on satisfaction.]]>

how can I interpret the results in SPSS ?

when I do this that appears

Conf. Interval Type Wald

Conf. Interval Level (%) 95

Estimation Method Firth penalized maximum likelihood

Output Dataset –NA–

Likelihood Ratio Test 38.0566

Degrees of...

firth logestic regression]]>

how are you ?

I'm new here

im looking for websites where i can find data sheet and statistics in many fields FOR Free if not available then cheap and reliable website .

Best regards

Addo]]>

Suppose a traditional medical test says that the probability of a random sample of patients being positive to disease Y is 5%, but we know that the test is not accurate when identifying the positive cases. My assumption is that the real probability might be closer to 30% among the...

Using Bayesian statistics to improve classification task]]>

''Conduct a test to determine if on average there are more pieces produced on a day when products of type A are produced than on a day when product type D is produced. Write down the value of the test statistic and the conclusion of the test. Also conduct a test to conclude if on average there are more pieces produced when the manager is present than on a day when the manager is not present. Again write down the value of...

Which test to use? - HELP]]>

Time period (1-30) of the study (from 3/18/51 to 7/11/53)

Year within the study (0 = 1951, 1 = 1952, 2 = 1953

The first attachment is the set of original data and the second attachment includes the dummy variables.

Thanks]]>

I am trying to see the effect of income level towards fraud behavior. So in the so-called population, I have counts for each of the bad/good/new users:

BAD: 260

GOOD: 480

NEW:50

I also have a group of high-income users with these counts:

BAD: 50

GOOD: 95

NEW: 8

I am trying to see whether high income affects user fraudulent behavior. Can I use Chi-Square Goodness of...

Using Chi Square Test to check the effect of a variable?]]>

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]]>

I'm currently doing a marketing research project at university. It requires me to create a survey on Qualtrics and to then collect and analyze the data with SPSS. The project also

I. Chi square test for independence

II. Analysis of variance (ANOVA)

Now, I have divided the variable of "age" into three categories 20 years and below, 21-29 years, and 30 years and above. I want to determine the whether the...

Marketing research project - ANOVA or Chi Square test?]]>

I plan to find this out using mostly likert scale questions in my survey.

However, I am wondering what statistical analysis I would use to analyse the data I...

What statistics test should I use?]]>

For example, suppose an instrument has a documented SD of...

Relationship of precision of mean of repeated measurements and precision of single measurement]]>

In other words, If I have correctly understood, if n is sufficiently large (there are various conventions in this sense, for example,

Central limit theorem and sampling distribution - Doubts]]>

Johnson Electronics makes calculators. Consumer satisfaction is one of the top priorities of the company's management. The company guarantees the refund of money or a replacement for any calculator that malfunctions within two years from the data of purchase. It...

Finding Standard Deviation]]>

Assume that the precision of the measurements is fixed and independent – each measurement has the same...

How to calculate the precision of the mean of univariate time series data, based on the precision of the discrete measurements it consists of]]>

I’m a high school social studies teacher and I was wondering how I can analyze my students’ engagement level with the online platform where students do various homework/assignments (readings, discussion, quiz, etc.…). I’m using Canvas and I can see the variables including the number of pages students view, actions (writing on discussion board, submitting quiz and so on), grade distribution, on-time/late/missing submission. Can anyone help me to design a simple model to research...

What kind of test should I use?]]>

I have a set of values which are a time series and follow a decreasing exponential distribution.

I would like to understand what the best method might be to predict the next value in the series.

Do the options include

1. Transforming the variable to try and get normality.

2. Creating an autoregressive model of some nature

thanks

Scott]]>

I have a question in Conditional Probability and I would appreciate if you could help me solve it.

I have the probability of of the Hourly temperature of the day. if my temperature varies from -3,-2,-1,0.....+9 and I know the probability for each temp. every hour through the day (for example that probability that the temp is +1°C at 12:00 am is 13% and at 01:00 am is 15% and so on for 24 hours.

How could I know the probability that the hourly temp. will be:

a) the same for...

Conditional Probability of several events]]>

I need your guidance about the analysis, as you are good at statistics.

I explain my experimental design.

Actually I inoculated 3 microorganisms (ASS-ASL and ASY using different concentrations i.e. 50-75 and 100ul/L). I wanted to check if these organisms at different concentrations affect the growth of wheat seedlings. I had 4 replicates for each treatment and 4 CK control for each treatment (No inoculation of microgranisms). As I am not clear, I can send you my raw data...

Statistical analysis in agriculture and agronomy]]>

-2Deviations = Mean / 6.5]]>

I'm trying to calculate an estimate, for each decade between 1800 and 2019, of the number of German-descent population in North America (Canada and the U.S.). I came up with something of a methodology to do that, based on some facts from 1790: that Germans made up 8,7% of the white population of the United States, that the white population of the U.S. numbered 3,172,006...

Problems with estimating the growth of a population.]]>

Would be thankful for every comment or idea.

So i think: HHHHHHHHHHHHH 13x heads or 12x H 1x T HHHHHHHTHHHHH wont be the most frequent...

13x times coin toss (most frequent sequence)]]>

Also are there circumstances where one would round up a decimal<5 and round down a <4. Any round off examples? Thanks.]]>

I am very confused about how to select the appropriate statistical method (parametric or not) by considering N number in the dataset. Some references say that if the N number is below 30, parametric tests cannot be used but some others say that it is not necessary to reach 30 subjects to perform a parametric test as long as the dataset shows a normal distribution.

Can you please provide simple explanations and/or suggest some references that supports both points of view?

Any help will...

N>30, or not! This is the question!]]>

What I want to figure out is if there is a significant difference in the prescription rates of medicine 1 between males and females.

Which statistical method should I use to test the difference? (I use SPSS)

Any helps will be pretty much appreciated.

P.S.: The dataset...

Probably A Very Simple Question (but I am not able to figure it out)]]>

I'm doing an analysis on a set of data with a dichotomous independent variable (drug or placebo) and a dichotomous dependent variable (sick or not sick). Would you run a logistic regression analysis?

Thank you in advance!]]>

I am doing an econometrics course where I am to do a regression analysis on some firm data.

I want to analyze some shipping data of frozen goods to predict the temperature of the shipped goods at their end destination.

My problem is that I am unsure which kind of analysis to make when I am interested in both time-variant and in-variant variables

My data:

I have approx 100 data points for different shipments. For each data point, I have the starting temperature of the products (same for...

Choice of model/strategy for multiple regression analisys]]>

I understand chi square tests of independence, and have read the FAQ on chi square tests. What confuses me somewhat is the use of chi square in some instances.

I have always understood a chi square test of independence as being a test of an

And I have always understood...

Chi square test of independence - test of difference or association?]]>

When I see this done with an intercept only model I notice the examples are taking the parameter and reversing the sign in generating the following formula to generate predicted probability.

pp = e to the parameter value [they actually use the negative parameter so if its .2 they use e to the negative .2 power]/1+ e to the negative parameter value.

Not sure if I am getting this right.]]>

Interpreting logistic regression]]>

I have arrived at some results through brute force but would like to understand or incorporate some formulas if possible.

If you are not in the San Jose, CA area, I can set-up WebEx meetings. If you are, in person would be great.

If you are interested, please contact me by email at sjelso@yahoo.com and let me know your rate.

Cheers...]]>