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  1. AngleWyrm

    Creating a scale with dichotomous and continuous items

    Check out Principal Component Analysis
  2. AngleWyrm

    How to test this scenario?

    So you have a population of all people, and four samples drawn from that population, called red, brown, blonde, and black. Since this is a problem where sample sizes differ, we should use a z-score that takes sample size into account. Normal z score = (observation - average)/(standard...
  3. AngleWyrm

    Cross-national comparison best methodology and research questions advice

    I hypothesize attitudes toward justice correlate with annual wages. Does the survey taker earn more than the median for 1 person? More than ten people? Less than 1/5th?
  4. AngleWyrm

    Chance performance in a binary response task

    80/100 = 4/5 of answers are true, 1/5 of answers are false. If the subject knows this, then their best guessing strategy is to guess true 4/5 of the time and false 1/5 of the time.
  5. AngleWyrm

    A coincidence isn't that unlikely?

    Gambler's Fallacy
  6. AngleWyrm

    A coincidence isn't that unlikely?

    The Gambler's Fallacy is a trick of memory, where the observer considers what has been observed but doesn't remember what hasn't taken place.
  7. AngleWyrm

    Question Regarding Standard Deviation of Rate Vs. Time

    Mean for the rate in ml/s wasn't calculated in the original, so I madea copy and added it (blue outlined cells) I also agree the time to complete the fill operation is a better measure. The average speed in ml/sec varies considerably between pumps, and so a small variance in the smallest...
  8. AngleWyrm

    simple count - type of data

    Let's say I'm a test subject, and I recall 15 words. That information alone isn't very informative until we also include the fact there are 50 words. Then we have a proportion: 15 out of 50 words = 15/50 = 3/10 = 30% of the total words.
  9. AngleWyrm

    An investor is considering funding of a new video game.

    Confidence Level: 90% Margin of Error: 5% According to this sample size calculator, the ideal sample size is 271 for very large population, the first answer listed in post #4
  10. AngleWyrm

    Help with experience-sampling data analysis plan and multilevel linear modelling

    Standard error solves problems that standard deviation alone can't. Standard deviation -- average distance away from average -- is good for some problems, but doesn't have anything to say about sample size. Whereas standard error takes into account the sample size; it's still standard...
  11. AngleWyrm

    Help with experience-sampling data analysis plan and multilevel linear modelling

    The problem you're referring to is standard error = (standard deviation) / Sqrt(sample size), used for z-score = (observation - mean)/(standard error) that measures how outstanding an individual is relative to the sample average. As the sample size goes up the standard error goes down, and so...
  12. AngleWyrm

    Help with experience-sampling data analysis plan and multilevel linear modelling

    Example data, with polynomial trend line for x starting attitude = x^0 = 0.875 velocity = x^1 = 0.196x rate of change (acceleration) = x^2 = 0.161x^2
  13. AngleWyrm

    Help with experience-sampling data analysis plan and multilevel linear modelling

    So it's a measurement that can change over time, and you're interested in the rate of change, aka acceleration. enjoyment / sessionTime^0 = location enjoyment / sessionTime^1 = velocity enjoyment / sessionTime^2 = acceleration
  14. AngleWyrm

    Standard deviation of an average of a number of results

    The data given isn't normally distributed It's skewed by 0.5395 and so calculations on the area beneath the curve will have to take that into account.
  15. AngleWyrm

    Help writing hypotheses!

    yes, the two standard deviations are part of the denominator. The MATH thing doesn't seem to be translating LaTex.
  16. AngleWyrm

    Help writing hypotheses!

    Statistics Knowledge Portal corellation(x,y) = covariance(x,y) / standard deviation(x) * standard deviation(y)
  17. AngleWyrm

    Help writing hypotheses!

    correlation and p values
  18. AngleWyrm

    Help writing hypotheses!

    There are four possible outcomes to a hypothesis test
  19. AngleWyrm

    Help writing hypotheses!

    That's a decision threshold you must choose, typically selected as 0.05 For example:
  20. AngleWyrm

    Help writing hypotheses!

    Two hypotheses, stated as the opinion hypothesis vs it's alternative: H1: There is a positive correlation between FDS and SAS H0: There isn't a positive correlation between FDS and SAS H1: There isn't a correlation between FDS and STAI H0: There is a correlation between FDS and STAI The p...