Dear R users, I'm trying to fit a set an ODE to an experimental time series. In the attachment you find the R code I wrote using modFit and modCost of FME package and the file of the time series.
When I run summary(Fit) I obtain this error message, and the values of the parameters are equal to the initial guesses I gave to them. The problem is not due to the fact that I have only one equation (I tried also with more equations, but I still obtain this error). I would appreciate if someone could help me in understanding the reason of the error and in fixing it. Thanks for your attention, Paola Lecca. Here the error: > summary(Fit) Parameters: Estimate Std. Error t value Pr(>|t|) pro1_strength 1 NA NA NA Residual standard error: 2.124 on 10 degrees of freedom Error in cov2cor(x$cov.unscaled) : 'V' is not a square numeric matrix In addition: Warning message: In summary.modFit(Fit) : Cannot estimate covariance; system is singular
time pp1_mrna 0 0 2 2.754 4 2.958 6 4.058 8 3.41 10 3.459 12 2.453 14 1.234 16 2.385 18 3.691 20 3.252
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