anova

  1. S

    Factorial experiment in CRD with unequal replications

    Hi guys, i am a graduate student in statistics. i want to test for the main and interaction effect of 3 treatments on a group of patients. let say i have treatments A, B and C. each with 2 levels, presence and absence. So i decided to perform a 2^3 factorial Experiment in a Completely...
  2. M

    Anova or t-test on squared errors

    I have two forecasting models, moving average and single exponential smoothing. The values of Mean Absolute Percentage Error (MAPE) is 5.2%, 5.8%. Since the difference of MAPE between the models are very close, I am quite confused which model to choose. Can we perform a t-test or ANOVA on...
  3. S

    Is ANOVA applicable for my study?

    Hi, Here's some info about my study: Looking into stereotype threat and mapping ability, hypothesising that females will perform less well than males when gender priming is used. Stereotype threat suggests that people perform less well in conditions whereby they belong to a group that...
  4. M

    Which test to use for these variables and their associations

    Hey, I have some questions about which test I can or have to use. Which test do I use to only identify if there is a relationship between those variables? I only want that to know, for the identification of confounding factors. Ordinal dependent categorical variable <-> ordinal...
  5. S

    Anova

    I am trying to find the effects of feed rate, cutting speed and depth of cut on surface roughness. I have five sets of feed rate ( 0.09, 0.10, 0.125, 0.150. 0.175), four sets of speed (41, 53, 66, 82) and two sets of depth of cut (0.5 mm and 1 mm). Like: 0.09-41-0.5 = 3.65 0.09-53-0.5 =...
  6. M

    P-Value in overall ANOVA vs. TukeyHSD

    Hey Everyone, I've been learning stats on the side and have some difficulty understanding the different methods of comparing means. I used R and would have posted in their forum, except this is more theory. When I used the anova function on a data set, I got a low p-value and high F -...
  7. A

    2x2 Anova, im struggling to report the assumptions

    Hello, I've ran a 2x2 anova and am trying to report the assumptions but would like to make sure ive done it correct, statistics is my weak point! I have tested normality and homogeneity and also tested for skew and kurtosis. Then am I supposed to report the means and the significance levels...
  8. C

    2x2 mixed ANOVA interaction - do I analyse simple main effects?

    I've conducted a 2x2 mixed factorial ANOVA: IV1 - repeated measures (control vs. experimental) IV2 - between groups (I counter-balanced the order so the groups are Order 1 and Order 2) There is a significant interaction between the two IVs. I can see from a graph where the interaction is...
  9. K

    ANOVA using time variables

    I am trying to find the difference between 3 groups to determine if the times between authorization to an event is different (longer, shorter). They are measured in hh:mm:ss. Can you run an ANOVA using time variables. I never ran it before but assume it works. However, my data is not normal...
  10. A

    twoway ANOVA, post hoc test? New to statistics.

    This is probably easy, but this is new to me, hoping for some help here:tup:
  11. K

    Calculating Variance Explained by Effect: High Intercept Sum of Squares Problem

    Hi :) Context: I'm using G*Power to conduct a post hoc power analysis. The study design is a 2x2 Two-Way ANOVA. ANOVA was done in SPSS. Within G*Power, I'm using Protocol of power analyses -> F tests -> ANOVA: Fixed effects, special, main effects and interactions. Then to get the effect...
  12. B

    Mixed Repeated Measures and Independent Measures One-Way ANOVA [SPSS]

    Hello, I am trying to determine the best way to carry out my one-way ANOVA in SPSS. I have three groups: Pre-Surgery, Post-Surgery, and Control. Technically, the Pre- and Post-Surgery groups are repeated measures but the comparison to the control would be independent. How would I go...
  13. O

    Variables are awkward. Which test should I run for this memory experiment?

    Basically I'm doing a recall experiment where participants are separated into 2 groups and asked to visualize the words in a specific context depending on the group. I am measuring how each independent variable does in recall (not interested in the interactin of the IVs with each other). Which...
  14. H

    Help! What statistical analysis test should I use?

    Hello, I am no good at statistics and need help figuring out which statistical test I should use for a hypothetical research project. This is for a paper- I am not actually doing the research. Therefore, I probably have not defined all of variables necessary...but here goes...your help is...
  15. P

    Test to identify bias in staff recording data - some guidence please

    Hi, First post on this forum. Have tried to search for the correct answer in this forum, but have not found it (perhaps I'm not searching correctly) I am involved in a project where staff observe items and record their observations on an input device (iPads in this case). The data set is quite...
  16. L

    Non Significant ANOVA results - need to explain why.

    I was given data to work on for a lab report. I did a 2 x 2 between subjects ANOVA (if it matters n=187). Main effect of IV1 was not significant. Main effect of IV2 was not significant. Interaction was not significant (although was .62 which I'm supposed to report as "marginally...
  17. S

    Which STAT to use? Compare one persons total Seizures in a month over 12 months

    My goal is to find out if there is a significant difference between the total numbers of seizures in a month over the course of a year for one individual. I have collected data for September, October, November, December and January. I want to carry out a statistical analysis comparing months...
  18. J

    RM-anova: Plotting a 3-way interaction in one graph or two graphs?

    I'm wondering if it's possible to plot my 3-way interaction in one graph in SPSS for my thesis. My design is: Dependant variable: Amount of correctly translated words Within-subjects: valence of words (Positive/Negative/neutral) within-subjects: time (posttraining/followUp)...
  19. M

    General linear mixed model - 5 years

    Dear all, every help is highly appreciated! I have a data set that looks like the one I attached to this post. I have five independent variables for each company (for each time period one). Now I need to know, if the values significantly increase over the time of five year. In other words I...
  20. R

    Calculation of Sample Size for one-way ANOVA

    Hello, I have problem of calculating sample size for one-way ANOVA. My settings is the following: Population size = 100 Controlled group = 1 group Treatment group = 2 groups Power = 0.8 Alpha = 0.05 Group allocation ratio: All groups have the same sample size standard deviation of...