percentages

  1. S

    Percentages and statistical significance

    This might be a deceptively easy question, in which case I'm sorry. In an experiment involving word lists and critical lures (i.e. recreation of Roediger and McDermott, 1995), participants were either given a distractor task or asked for immediate recall of word lists. We found that a high...
  2. S

    Statistically significant changes in proportions - comparing 3 populations

    I have data from three populations, 2 observations each populations (opinion poll data from different countries). I am trying to find out if any changes in opinion on the issue i am investigating are statistically significant. So, for one topic In 2010, Group 1 answered 20% yes, Group 2...
  3. P

    representative sample? comparison of variance?

    Hello. i did an online survey. i was able to classify the responses by the districts they came from. I also obtained the total population for each district. i would like to know if my sample is representative. i used a f-ratio comparison of variance. is that the correct test? if no please tell...
  4. O

    Indices with data bound between -1 and +1

    Hi all, I would really appreciate some advice on how to deal with my data. I would like to compare data calculated from an index which is bounded by -1 and +1. I was surprised to see that previously published use of this index has been analysed using standard ANOVA, because I was led to...
  5. J

    Modelling percentages in the closed interval [0-1]

    Hi all, I am trying to model percentages which are in the closed interval [0,1] . Specifically, I am not modelling the probability of a yes/no outcome (for which logistic regression is often used), but I am modelling a continuous numeric variable which can take all the values in the [0,1]...
  6. M

    Comparing results presented as percents. Best method

    Hi folks, I was wondering if you could help me wrap my head around the best way to present some data and the best statistical test to use to illustrate a comparison. Here is the breakdown: Group A (N=41) was asked to complete a questionnaire that asked them specific questions on a topic...
  7. P

    proc tabulate: am i using correct weight statement?

    Background: for my dataset I produce a contingency table with proc TABULATE of all case characteristics crossed with the type of clinic they attended (3-levels). In the contingency table I also have SAS calculate the percentage of cases using the denominator of the clinic-type level...