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Latest Discussions

• How do you calculate power in a retrospective cohort study?

  I did a retrospective study to compare the efficacy of two different treatments for the patients with infertility problems. I got negative results. How can convince the readers that this is not an underpower study? What is the point of calculate power if the study has been completed?

  fgaochori

  Discussions |

  Dec 14, 2023 3:38 AM

  4704 views | 2 replies

• Sphericity test not performed due to insufficient error degrees of freedom

  Hi,I have Heart rates from 3 different groups collected at 7 times differents points. I would like to perform a repeated measures ANOVA. To do so, I would like to check sphericity assumption. I found online that you have to split your data and then Analyze > fit model, I add my 7 times in "Y" then Group in "Construct model effects", then Personality "Manova", Run. I checked “Univariate Tests Also”...

  ClassMegalodon6

  Discussions |

  Dec 14, 2023 2:54 AM

  1026 views | 0 replies

• How to set the range for mixture components and linear constraint in Extreme Vertices Design

  Hi, I am trying to do a screening of mixture with 12 components using extreme vertices mixture design. I have the specific range to test: X1: 0.541 to 0.784X2: 0 to 0.147X3: 0 to 0.08For X4 to X 12, I am testing them using the same range between 0.216-0.324 to find which of them are suitable for my formulations. However, when I tried to key in the lower limit, only 2 components are possible. From ...

  LatinLinkages95

  Discussions |

  Dec 14, 2023 12:47 AM

  2650 views | 4 replies

• How to receive numerical input from user, save as a variable and use variable in control chart builder as the set control limits

  Hello, I am looking for a way to collect 6 numerical entries from a user at the beginning of a script. These 6 numbers need to be saved as variable which I am hoping to reference later as Levey Jennings control chart limits.  using the code below works with numbers but would like to change to reference the variables which have been set instead. <Set Control Limits( {LCL( a ), UCL( b ), Avg( c )} )...

  GN19

  Discussions |

  Dec 13, 2023 8:40 PM

  1314 views | 2 replies

• How do I use the integrate function with a predictive formula generated from a raw data set

  Hello!
  
  I'm attempting to find the area under a curve of a data set between specific time intervals (x-axis). I have taken the raw data which was analyte concentration (y) across time (x) and ran it through a fit curve model that generated a predicted equation that fits the raw data with R^2 =0.95.
  
  I'm a bit confused of my next step, I've tried to plug the equation in as a formula in a new column and...

  BimodalTrees188

  Discussions |

  Dec 13, 2023 5:27 PM

  1618 views | 1 replies