what is the trend of a hemoglobin level what stata test can i run on an x-axis which statistic is used to plot trend in stata or r what test is used to determine trend in stata what statistical testing is used to measure a trend of hemoglobin in stata x axis hemoglobin trend why is hemoglobin a constant variable? what test for trend in stata can you predict when hemoglobin is increasing and lowering which axis does a statistic test for trend how would you test for trend in stata? what test can use to test whether a trend is significant? how to test trends in stata which statistic is used to test for trend and a trend in stata what statistic can be used to test whether hemoglobin level is changing or increasing? how to measure trend in stata what is the test of trend in stata or r which r tests can be used to plot a trend? when does hgb trend why use stata to test trend