Description Usage Arguments Details Value Examples

This function displays d for between subjects data and the non-central confidence interval estimating from the t-statistic.

1 |

`t` |
t-test value |

`n1` |
sample size group one |

`n2` |
sample size group two |

`a` |
significance level |

To calculate d, the t-statistic is multiplied by two then divided by the square root of the degrees of freedom.

d_s = 2 * t / sqrt(n1 + n2 - 2)

Learn more on our example page.

Provides the effect size (Cohen's d) with associated confidence intervals, degrees of freedom, t-statistic, and p-value.

`d` |
effect size |

`dlow` |
lower level confidence interval of d value |

`dhigh` |
upper level confidence interval of d value |

`n1` |
sample size |

`n2` |
sample size |

`df` |
degrees of freedom (n1 - 1 + n2 - 1) |

`t` |
t-statistic |

`p` |
p-value |

`estimate` |
the d statistic and confidence interval in APA style for markdown printing |

`statistic` |
the t-statistic in APA for the t-test |

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | ```
#The following example is derived from the "indt_data" dataset, included
#in the MOTE library.
#A forensic psychologist conducted a study to examine whether
#being hypnotized during recall affects how well a witness
#can remember facts about an event. Eight participants
#watched a short film of a mock robbery, after which
#each participant was questioned about what he or she had
#seen. The four participants in the experimental group
#were questioned while they were hypnotized. The four
#participants in the control group recieved the same
#questioning without hypnosis.
hyp = t.test(correctq ~ group, data = indt_data)
#You can type in the numbers directly, or refer to the dataset,
#as shown below.
d.ind.t.t(t = -2.6599, n1 = 4, n2 = 4, a = .05)
d.ind.t.t(-2.6599, 4, 4, .05)
d.ind.t.t(hyp$statistic,
length(indt_data$group[indt_data$group == 1]),
length(indt_data$group[indt_data$group == 2]),
.05)
#Contrary to the hypothesized result, the group that underwent hypnosis were
#significantly less accurate while reporting facts than the control group
#with a large effect size, t(6) = -2.66, p = .038, d_s = 2.17.
``` |

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