I have a data where I am testing the effect of some independent variables on the count of a dependent variable. So I did a Poisson regression and got the following results.

In the above table, all my correlations seem significant, except from var1. My issue is how to interpret these results. I am trying to compare the effects of my independent variables and I am not sure how the results can help me with that. For example, can I say that var3 is...

Poisson Regression Interpretation]]>

A casino offers you a gamble with a 1% chance of winning a try.

How many tries will it take to win at least once? The answer involves two variables, the chance of success each try and an allowance to be wrong in exchange for predictive accuracy. For this example, I choose 95% confidence, a willingness to be wrong once in twenty:

tries = log(chanceToBeWrong) /...

Ideal level of confidence/certainty]]>

I would like to determine which predictors most strongly influence my outcome variable accounting for repeated measures of the two timepoints.

A factor analysis was suggested to me (as the first and final step for my purposes), yet this will not be...

Lasso Regression, Repeated Measures]]>

That is specifically the type of more advanced skills I need. To tell what is possible and what is not, which of the many forms...

intermediate regression books]]>

Essentially we are looking at wages two quarters after people leave our agency as the dependent variable. We have never analyzed (nor has the academic community apparently based on the research reviews I have done) what leads to higher income for the Vocational Rehabilitation community...

Wage project]]>

article_1793_f057b172096c72541b7c83c66b8ba69c.pdf (ejmcm.com)]]>

The RALES study

The journal can be found Here if you're interested.

I take no issue with the study, but can't...

Wilcoxon test.]]>

In Life

Some mock me for doing statistics

Some loathe me and statistics

Some don’t understand what statistics are

Why is it that statistics

Put a calm smile on my face?

Because of statistics I can solve the deepest mysteries

Because of statistics I will not be lonely again, playing in the data

Because of statistics I can rearrange the stars in the skies above

(by Chinese statistician Wang Jiaowei [translated],

The...

Statistics Poetry]]>

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>File not found.

>Execution of this command stops.

>Error # 100. Command name: VARIABLE LABELS

>This command is not permitted before the beginning of file definition

>commands.

>Execution of this command stops.

>Error # 105. Command name: execute

>This command is not valid before a working file has been defined...

IBM SPSS Statistics Viewer Error]]>

Thank you so much!]]>

I'm wondering if I can get some assistances on how I can employ K-fold cross validation to data that needs to be split into groups. I know how to employ the K-fold cross validation for standard data where each row is an independent event, however in the example of horse racing context what do I need to do to my code to modify it to suit grouped data to avoid mixing horses from one race to another and even mixing between test and training samples? Each race/independent event in my...

K-Fold Cross validation into groups]]>

proc plm]]>

1) Is it still true there is no (non bootstrap) way of generating SE for lasso? If so how do you do statistical test?

2) One article I read said that all variables had to be standardized to use bootstrap? Is that true?

3) I understand that lasso assigns a penalty to shrink various estimates. But I don't understand substantively which will shrink more than others (that is the basis they will shrink). I have to admit although I...

Lasso regression]]>

I have a (maybe) basic question. I have this binominal logistic regression model:

Dependent var: Work full-time (dummy var: 1=work full-time; 0= work part-time)

Independent var: categorial var (1= the first generation; 2=the 2nd generation; 3=3rd+ generation) --> recoded into 3 dummy variables.

Controls for several indicators (sex, age, education,...).

I ran this model twice. The first time with the first generation as the reference group. The second time with the second...

Different results when changing the reference group in logistic regression]]>

Testing social media mentions for statistical significance]]>

I'm sorry for not using the correct terms, but I have a problem that involves multiple layers of probability that I could solve by myself eventually, but it would take days of manual labour to systematically work through, so there must be a faster way. I would very much appreciate any advice on how to create an equation to address this puzzle.

Imagine a game where a letter is posted to a random address. The recipient of that letter will then forward it to a new address, and so on and...

Multiple layers of probability]]>

Relative impact]]>

This question may be rudimentary, however I haven't touched statistics for a very long time and therefore became quite incompetent.

In my experiment participants were asked to rate several parameters multiple times (each time after completing a task).

I'm looking to correlate this parameters however as i mentioned most of my observations are task based (lets say, difficulty to complete each task) but some are participant based (number of total task completed correctly, rating...

Correlating parameters based on participant rather then observation]]>

How can someone explain statistics for audience involved in "Business" . As an example :

1.What does variance or Standard deviation ,percentiles means in marketing ?

2.what does Probabilities distribution means in marketing ,finance, sport etc. ?

How can my statistics interpretation helps in decision making?

Kindly help]]>

When I try to change any of these variables to numeric from string a window in SPSS pops up saying some value labels or missing value...

What to label my variables?]]>

I have some categorical data from questionnaires and made a chi-square analysis (most of the data had assumptions violated, so I used Fisher´s Exact test instead) followed by Phi or Cramer´s V to analyse the strength of association. My question is ... and then what? I know two variables are associated, I know if it is a strong or weak association, but I would like to know which category from the variable...

Categorical variables in SPSS - Chi-square and then what?]]>

I was wondering if you know a good book which can help in building up statistical knowledge in combination of working in SPSS?

I am using Field, but I don't like the book that much. I think it is a little messy sometimes and when I want to do an analysis, I need to go back and forward a lot and also skip through the comical parts.

I was thinking of buying Hayes for all the moderation-/mediation related regression models, but I am also looking for a little bit more basic...

Best book - Combination of statistics & SPSS?]]>

I am running an analysis for a experimental study and would like to get some opinions about the most appropriate method.

- I have two groups: control (no treatment) and experimental groups (intervention)
- I test all individuals before the experiment and after (pretest-posttest)
- I collect 10 different measures from each participant before and after; 5 physical condition measures, 4 emotional state measures and 1 motivation/productivity measure, so the total of 20 measures...

SPSS Analysis for Pre-test & post-test, control group design]]>

I need to know how to solve and write down for those solution.

Thank you]]>

By using univariate analysis (McNamer/Wilcoxon), I found that there is no statistical difference between case and control groups (checked for one of my dichotomous independent variable).

When I used COXREG (in order to create consitional log regression in SPSS) and analysed the same independent variable (analysed alone in regression) - I realized there was a...

Help- conditional log regression]]>

I am not a statistician and I am only a beginner in this field.

I would really appreciate any help on this subject of regression.

I have a sample size of 37 with 9 predictors.

The predictors are (family size(categorical so its converted to dummy variable), total no of appliances (scale ), total no of rooms(scale ), total appliance usage hours(scale ), tarriff price of electricity(scale ), income group(categorical so its converted to dummy variable) etc)

The DV is energy consumption...

Multi-variate regression for a small sample]]>

I have recently conducted a validation study on a 7-item survey.

For the factor analysis, I have calculated

1. Determinant of the correlation matrix Det = 0.030

2. Bartlett test of sphericity Chi-square = 685.883 Degrees of freedom = 21 p-value = 0.000 H0: variables are not intercorrelated

3. Kaiser-Meyer-Olkin Measure of Sampling Adequacy KMO = 0.847

Afterwards I have conducted FACTOR ANALYSIS with principal component factor Factor analysis/correlation

Factor...

factor analysis: PCA vs EFA]]>

Y = X_1**2 + X_2**2 + ... + X_k**2

with X_i independent standard normally distributed (mean 0, std 1).

The expected value of a sum of variables is

E(X_1 + X_2) = E(X_1) + E(X_2)

The expected value of a product of independent variables is

E(X_1 * X_2) = E(X_1) * E(X_2)

Combining all of this

E(Y) = E(X_1**2 + X_2**2 + ... + X_k**2)

= E(X_1**2) + E(X_2**2) + ... + E(X_k**2)

= E(X_1)*E(X_1) + E(X_2)*E(X_2) + ... +...

Expected value of chi-square distribution]]>

I am currently completing my dissertation and my supervisor wants me to include a statistical significance test in relation to the data which I received.

This is what he has asked:

- I was wondering if we can extrapolate these local findings nationwide- and provide the 95% CI of these two estimates?

- Is it possible to run some significance tests for these observations between compliant and non-compliant, which looks significant...

Statistical Significance]]>

I compared different ways to calculate confidence intervals. On the one side I used the direct formular on the other side I used a percentile bootstrap methoden. (Calculate the statistic (e. g. mean) on n subsamples and choose the a/2 and 1-a/2 percentile for the confidence interval.)

I noticed that applying the bootstrap method with replacement and a sample size that equals the original sample leads to (almost) the same confidence interval than the one I calculated by formular. The...

Why does bootstraping with 50% samplesize and no replacements always gives appropriate confidence intervals.]]>

I'm making an MLB Model and I'm at a point where I'm stuck.

I have the AVG Runs Scored for each team, and the Standard Deviation of Runs Scored for each team for the season as well. If I know that one team is facing a pitcher who is superb, let's say 15% better than the league average, I will multiply the AVG Runs Scored by .85 to try and get a better indication of how many runs I can expect the team to put up.

My question is, do I have to multiply the Standard Deviation by .85...

I have a Mean and Standard Deviation. If I multiply the Mean by a number (non-constant), do I have to multiply the Standard Deviation by that number?]]>

Is possible to calculate the possibilities of an unvaccinated man to die?]]>

Chance weights are integer values that represent outcomes to a random event. A flip of a coin has two outcomes, each with a chance weight of 1. A roll of a pair of dice has 36 chance weights partitioned across 11 possible outcomes like so: {1,2,3,4,5,6,5,4,3,2,1}.

I start with randomly chosen from this set of chance weights: {1, 3, 6, 10, 15, 21, 25, 27, 27, 25, 21, 15, 10, 6, 3, 1}.

There are 216 chance weights, allotted to 16 possible outcomes.

But this...

Scaling chance weights]]>

so,

can Multivariate normality avoid overfitting scenarios?

Because, if we have a normally distributed features, then estimated co-efficients will work perfectly on entire unseen populations of all independant features.

Thanks,

param]]>

There seems to be very little activity here. Several years ago 'SPSS help forum' was quite active but I can't find it now. Can anyone recommend an alternative?

Thank you.]]>

Code:

```
Row │ hryear4 prmjind1 prcnt_minority median_wage wage_10 median_age
│ Int64 Int64 Float64 Float64 Float64 Float64
─────┼─────────────────────────────────────────────────────────────────────
1 │ 2010 1 54.9525 10.0 8.0...
```

Include Month Variable in GLM?]]>

This is not about causality per se, I know that correlational studies can not show that...

How do you know if X is moving Y in non-experimental data.]]>

I'm thinking of using the Mann-Whitney test but I have also read it is not the best for differently shaped distributions. I also have various sample sizes, some are below 30 per group, others are above 400 per group. Also, the majority of my data have unequal...

Statistical test for non-normal, dissimilarly distributed data?]]>

Code:

`Row │ hryear4 prmjind1 prcnt_minority median_wage wage_10...`

This is the code

PROC LOGISTIC DATA=WORK.SORTTempTableSorted

PLOTS(ONLY)=ALL

;

CLASS pd2 (PARAM=REF) pd1 (PARAM=REF) pd3 .....;

MODEL DVD (Event = '1')=pd1 pd2 pd3 pd4 pd5 pd6 pd7 pd8 pd9 pd10 pd11 pd12 pd13 pd15 pd16 pd17 pd18 pd19 pd20 pd21 pd22 pd23 pd24 pd25 pd26 pd27 pd28 pd29 pd30 pd31 pd14 /

SELECTION=NONE

LINK=LOGIT

;

RUN...

Reference coding in SAS Proc Logistics]]>

I have a dataset that consists of Price and Quantity.

The industry has a price that changes every hour or every day, and is calculated off a Supply and Demand formula where both the supply and demand is constantly changing. The Demand part of this is the Industry demand for that hour of that day, but suppliers may be coming and going throughout the day with different quantities and price offers.

As a result there can be large fluctuations in Price between months, both from an overall...

Minimizing variance - can't seem to find the solution]]>