Diff for "FAQ/distFAQ" - CBU statistics Wiki
location: Diff for "FAQ/distFAQ"
Differences between revisions 49 and 50
Revision 49 as of 2012-07-10 15:08:51
Size: 3153
Editor: PeterWatson
Comment:
Revision 50 as of 2013-03-08 10:17:30
Size: 3187
Editor: localhost
Comment: converted to 1.6 markup
Deletions are marked like this. Additions are marked like this.
Line 3: Line 3:
 1. [:FAQ/itt:What is an intention to treat analysis?]  1. [[FAQ/itt|What is an intention to treat analysis?]]
Line 5: Line 5:
 1. [:FAQ/aster:How do I evaluate a number to a general power in SPSS?]  1. [[FAQ/aster|How do I evaluate a number to a general power in SPSS?]]
Line 7: Line 7:
 1. [:FAQ/cis:A note on comparing confidence intervals and statistical significance]  1. [[FAQ/cis|A note on comparing confidence intervals and statistical significance]]
Line 9: Line 9:
 1. [:FAQ/poolse:How do I obtain a pooled standard error of the mean?]  1. [[FAQ/poolse|How do I obtain a pooled standard error of the mean?]]
Line 11: Line 11:
 1. [:FAQ/semsd:How do I obtain the standard deviation from the standard error of the mean (s.e.m.)?]  1. [[FAQ/semsd|How do I obtain the standard deviation from the standard error of the mean (s.e.m.)?]]
Line 13: Line 13:
 1. [:FAQ/FVars: What is the variance of the mean of my transformed data and the variance of combinations of means?]  1. [[FAQ/FVars| What is the variance of the mean of my transformed data and the variance of combinations of means?]]
Line 15: Line 15:
 1. [:FAQ/meanmed:What is the relationship between the mean and the median from a sample?]  1. [[FAQ/meanmed|What is the relationship between the mean and the median from a sample?]]
Line 17: Line 17:
 1. [:FAQ/eorder: A quick approximation for Normally distributed expected order statistics]  1. [[FAQ/eorder| A quick approximation for Normally distributed expected order statistics]]
Line 19: Line 19:
 1. [:FAQ/subscale: How do I derive an expected total for a subset of items based on the expected overall total?]  1. [[FAQ/subscale| How do I derive an expected total for a subset of items based on the expected overall total?]]
Line 21: Line 21:
 1. [:FAQ/absdiff: How do I compute a difference in errors adjusted for overall number of errors when the errors have different signs?]  1. [[FAQ/absdiff| How do I compute a difference in errors adjusted for overall number of errors when the errors have different signs?]]
Line 23: Line 23:
 1. [:FAQ/ResidualsNonNormality:Residuals and (Non-)Normality]  1. [[FAQ/ResidualsNonNormality|Residuals and (Non-)Normality]]
Line 25: Line 25:
 1. [:FAQ/ResidsRepMeas:How do I check Normality assumptions in repeated measures analyses in SPSS?]  1. [[FAQ/ResidsRepMeas|How do I check Normality assumptions in repeated measures analyses in SPSS?]]
Line 27: Line 27:
 1. [:FAQ/Simon:Testing normality including rules of thumb for skew, kurtosis in SPSS]  1. [[FAQ/Simon|Testing normality including rules of thumb for skew, kurtosis in SPSS]]
Line 29: Line 29:
 1. [:FAQ/Winsor:Methods of handling outliers.]  1. [[FAQ/Winsor|Methods of handling outliers.]]
Line 31: Line 31:
 1. [:FAQ/EXponential: How do I produce truncated exponential random variables using MATLAB?]  1. [[FAQ/EXponential| How do I produce truncated exponential random variables using MATLAB?]]
Line 33: Line 33:
 1. [:FAQ/mixtures: How do I obtain parameter estimates for finite Normal mixture distributions using SPSS and BMDP?]  1. [[FAQ/mixtures| How do I obtain parameter estimates for finite Normal mixture distributions using SPSS and BMDP?]]
Line 35: Line 35:
 1. [:FAQ/perc: How do I find out how many people have a score above a certain value?]  1. [[FAQ/perc| How do I find out how many people have a score above a certain value?]]
Line 37: Line 37:
 1. [:FAQ/percentile: How do I compute percentile thresholds for exponential data and use in outlier detection?]  1. [[FAQ/percentile| How do I compute percentile thresholds for exponential data and use in outlier detection?]]
Line 39: Line 39:
 1. [:FAQ/rand: How do I generate a random sample in EXCEL?]  1. [[FAQ/rand| How do I generate a random sample in EXCEL?]]
Line 41: Line 41:
 1. [:FAQ/rtest: Some thoughts on testing for randomness]  1. [[FAQ/rtest| Some thoughts on testing for randomness]]
Line 43: Line 43:
 1. [:FAQ/MeanSum:How do I obtain the mean of several variables, each minus the same constant? (In SPSS)]  1. [[FAQ/MeanSum|How do I obtain the mean of several variables, each minus the same constant? (In SPSS)]]
Line 45: Line 45:
 1. [:FAQ/zscore:How do I compute z-scores in SPSS and what is their relationship to comparing group means?]  1. [[FAQ/zscore|How do I compute z-scores in SPSS and what is their relationship to comparing group means?]]
Line 47: Line 47:
 1. [:FAQ/signt:Why does my t-statistic have a negative sign?]  1. [[FAQ/signt|Why does my t-statistic have a negative sign?]]
Line 49: Line 49:
 1. [:FAQ/pvals:How do I use cumulative distribution functions to compute p-values in SPSS, EXCEL and R?]  1. [[FAQ/pvals|How do I use cumulative distribution functions to compute p-values in SPSS, EXCEL and R?]]
Line 51: Line 51:
 1. [:FAQ/surv:How do I adjust for age in comparing survival times in two different groups?]  1. [[FAQ/surv|How do I adjust for age in comparing survival times in two different groups?]]
Line 53: Line 53:
 1. [:FAQ/t1t2:What is the relationship between intercept and slope for scores at two time points?]  1. [[FAQ/t1t2|What is the relationship between intercept and slope for scores at two time points?]]
Line 55: Line 55:
 1. [:FAQ/atan:Arctan functions in EXCEL.]  1. [[FAQ/atan|Arctan functions in EXCEL.]]
Line 57: Line 57:
 1. [:FAQ/cdfs: How do I obtain statistical distributions in MATLAB?]  1. [[FAQ/cdfs| How do I obtain statistical distributions in MATLAB?]]
Line 59: Line 59:
 1. [:FAQ/gamma:How do I produce random variables which follow a negative skew distribution?]  1. [[FAQ/gamma|How do I produce random variables which follow a negative skew distribution?]]
Line 61: Line 61:
 1. [:FAQ/multinorm: How do I calculate probabilities involving the multivariate normal distribution?]  1. [[FAQ/multinorm| How do I calculate probabilities involving the multivariate normal distribution?]]
Line 63: Line 63:
 1. [:FAQ/boot: Simulations sampling from data with replacement (bootstrapping)]  1. [[FAQ/boot| Simulations sampling from data with replacement (bootstrapping)]]
Line 65: Line 65:
 1. [:FAQ/secretS: Bootstrapping without replacement (Secret Santa) in R]  1. [[FAQ/secretS| Bootstrapping without replacement (Secret Santa) in R]]
Line 67: Line 67:
 1. [:FAQ/mvngen: Generating multivariate data with a required correlation matrix]  1. [[FAQ/mvngen| Generating multivariate data with a required correlation matrix]]
Line 69: Line 69:
 1. [:FAQ/formulae: How do I obtain the formulae behind statistics outputted by SPSS algorithms?]  1. [[FAQ/formulae| How do I obtain the formulae behind statistics outputted by SPSS algorithms?]]

Questions about distributions of random variables

  1. What is an intention to treat analysis?

  2. How do I evaluate a number to a general power in SPSS?

  3. A note on comparing confidence intervals and statistical significance

  4. How do I obtain a pooled standard error of the mean?

  5. How do I obtain the standard deviation from the standard error of the mean (s.e.m.)?

  6. What is the variance of the mean of my transformed data and the variance of combinations of means?

  7. What is the relationship between the mean and the median from a sample?

  8. A quick approximation for Normally distributed expected order statistics

  9. How do I derive an expected total for a subset of items based on the expected overall total?

  10. How do I compute a difference in errors adjusted for overall number of errors when the errors have different signs?

  11. Residuals and (Non-)Normality

  12. How do I check Normality assumptions in repeated measures analyses in SPSS?

  13. Testing normality including rules of thumb for skew, kurtosis in SPSS

  14. Methods of handling outliers.

  15. How do I produce truncated exponential random variables using MATLAB?

  16. How do I obtain parameter estimates for finite Normal mixture distributions using SPSS and BMDP?

  17. How do I find out how many people have a score above a certain value?

  18. How do I compute percentile thresholds for exponential data and use in outlier detection?

  19. How do I generate a random sample in EXCEL?

  20. Some thoughts on testing for randomness

  21. How do I obtain the mean of several variables, each minus the same constant? (In SPSS)

  22. How do I compute z-scores in SPSS and what is their relationship to comparing group means?

  23. Why does my t-statistic have a negative sign?

  24. How do I use cumulative distribution functions to compute p-values in SPSS, EXCEL and R?

  25. How do I adjust for age in comparing survival times in two different groups?

  26. What is the relationship between intercept and slope for scores at two time points?

  27. Arctan functions in EXCEL.

  28. How do I obtain statistical distributions in MATLAB?

  29. How do I produce random variables which follow a negative skew distribution?

  30. How do I calculate probabilities involving the multivariate normal distribution?

  31. Simulations sampling from data with replacement (bootstrapping)

  32. Bootstrapping without replacement (Secret Santa) in R

  33. Generating multivariate data with a required correlation matrix

  34. How do I obtain the formulae behind statistics outputted by SPSS algorithms?

None: FAQ/distFAQ (last edited 2020-03-03 12:05:14 by PeterWatson)