Hi, how do I calculate the P for trend of crude incidence rates? Below is an example from a report. CIR=crude incidence rate in per million population. Thanks.
A pvalue for trend is kind of vague and doesn't tell you the magnitude or direction of the trend. Why not fit a Poisson model and include year as a predictor, so you can actually get an estimate with a precision value?
A pvalue for trend is kind of vague and doesn't tell you the magnitude or direction of the trend. Why not fit a Poisson model and include year as a predictor, so you can actually get an estimate with a precision value?
Dear hlsmith,
Thanks for your suggestion. Had tried log-linear regression using the ln(rate) regress on year and got the same results as the report. Source | SS df MS Number of obs = 9 -------------+---------------------------------- F(1, 7) = 0.17 Model | .022463524 1 .022463524 Prob > F = 0.6922 Residual | .923709053 7 .131958436 R-squared = 0.0237 -------------+---------------------------------- Adj R-squared = -0.1157 Total | .946172577 8 .118271572 Root MSE = .36326