Paired Samples T-test in R - Easy Guides | Paired t-test in R
Thepairedsamplest-testisusedtocomparethemeansbetweentworelatedgroupsofsamples.Inthiscase,youhavetwovalues(i.e.,pairofvalues)forthesamesamples.Thisarticledescribeshowtocomputepairedsamplest-testusingRsoftware.Asanexampleofdata,20micereceivedatreatmentXduring3months.WewanttoknowwhetherthetreatmentXhasanimpactontheweightofthemice.Toanswertothisquestion,theweightofthe20micehasbeenmeasuredbeforeandafterthetreatment.Thisgivesus20setsofvaluesbeforetreatmentand20setsofvaluesaftertreatmentfrommeasuri...
The paired samples t-test is used to compare the means between two related groups of samples. In this case, you have two values (i.e., pair of values) for the same samples. This article describes how to compute paired samples t-test using R software.
As an example of data, 20 mice received a treatment X during 3 months. We want to know whether the treatment X has an impact on the weight of the mice.
To answer to this question, the weight of the 20 mice has been measured before and after the treatment. This gives us 20 sets of values before treatment and 20 sets of values after treatment from measuring twice the weight of the same mice.
In such situations, paired t-test can be used to compare the mean weights before and after treatment.
Paired t-test analysis is performed as follow:
Calculate the difference ((d)) between each pair of value Compute the mean ((m)) and the standard deviation ((s)) of (d) Compare the average difference to 0. I...