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| bio | website | |
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| age | ||
| visits | member for | 2 years, 3 months |
| seen | May 10 at 4:10 | |
| stats | profile views | 77 |
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Apr 3 |
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Checking for differences in time trends What is the purpose of the replicate samples? Are they supposed to measure the same thing? |
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Apr 2 |
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Checking for differences in time trends What is the correlation between the replicate samples? For parsimony you might benefit from using only one sample if they are nearly identical. Alternatively, you could potentially create a latent variable using the measurements to more accurately reflect water quality. |
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Apr 2 |
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Power Analysis with Existing Data Set Also, I will mention that G*Power can help you identify the size of the effect using values often outputted by SPSS and other programs. If you say what specific statistical analysis you are doing (e.g., t-test, ANOVA, regression, correlation, chi-square) we can guide you more specifically. |
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Apr 2 |
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Power Analysis with Existing Data Set Lets say for example you are interested in looking at how length correlates with mercury levels. You already have data on this, so you can determine the approximate size of the effect between these variables. Lets say the correlation is .50. G*Power tell me that you need approximately 21 cases (fish) to have an 80% chance to statistically support this relationship in a future sample. This is a pretty layman explanation and perhaps a bad example, but that is the crux. You can calculate for t-tests, ANOVAs, etc. in G*Power. |
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Apr 2 |
awarded | Nice Question |
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Apr 1 |
answered | Power Analysis with Existing Data Set |
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Mar 27 |
awarded | Popular Question |
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Mar 25 |
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interval or ratio? What difference does it make (serious question)? Is this similar to arguing if a certain dish is a cake or a pie or does it actually have practical implications (e.g. do you have stats that depend on the answer)? This question comes up often and I have even asked this recently, but with a practical aspect. These concepts are immaterial and some argue the distinction is moot. |
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Mar 25 |
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interval or ratio? Why are you asking? Typically these questions have no applied value and people often discuss the distinctions only for interest sake or for arguments. Also, is this for an assignment? If so, I think this site has specific rules about asking for answers to an assignment. |
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Mar 21 |
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Best method to analyse whole population data I am curious to hear what this population is : ) |
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Mar 20 |
answered | MANCOVA or several ANCOVAS |
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Mar 20 |
answered | Comparing patient and control group results of a survey |
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Mar 19 |
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Which test to check statistical relationship betwen paired/unpaired data? It is possible that I am grossly mistaken, but I think your question requires a bit more information before someone can answer comprehensively. What do you mean by "matched data match"? I presume that is an error. What is the nature of the matching? |
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Mar 19 |
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Cluster analysis on weighted survey data with continuous and categorical variables Also note that depending on the complexity of the stratification, you may require Taylor Series Linearization, maybe. This is quite common if using data from a population-based survey. |
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Mar 19 |
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How can I predict the odds that a dodgeball team is going to win based on the winning history of its players? added 355 characters in body |
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Mar 18 |
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are there any statistically significant differences between my study population and a sub-group within it? I don't think his comment is that it is not possible, but rather that it might not make a ton of sense. The best thing to do would likely be to compare the 20 that COMPLETED to the 11 that DID NOT COMPLETE. This is, after all, likely the question of interest, is it not? To see if the 20 that COMPLETED differ from those who COMPLETED and DID NOT COMPLETE is unusual, since the second group would include the same individuals as the first. |
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Mar 18 |
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How can I predict the odds that a dodgeball team is going to win based on the winning history of its players? Thank you for your comment and for your edit. I figured a Bayesian or machine learning approach might be best. Unfortunately I am relatively unfamiliar with these approaches. |
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Mar 18 |
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How can I predict the odds that a dodgeball team is going to win based on the winning history of its players? added example |
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Mar 18 |
asked | How can I predict the odds that a dodgeball team is going to win based on the winning history of its players? |
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Mar 17 |
answered | Was Hitler a “black swan” event? |
