Origin Version (Select Help-->About Origin): 7
Operating System: windows
i have 3-5 data sets. a column of y values, a column of x values, and each set has a unique, single z value.
i'd like to fit the 3-5 curves and solve for a pair of parameters. the way i did this last year, was to make 7 columns of data: one x column, 3 y columns, and 3 z columns. since there is only one value of z for each column of y data, i just filled the whole column with the single value.
i defined my formula: y=p*(1-exp((-kinh*x*z)/(2*KI + z))). set up with 3 parameters (p,kinh,KI), one dependent variable (y) and two independent variables (z,x). clicked fit multiple data sets to give me the right number of data sets and assigned my x,y and z columns of data. i toggled kinh and KI parameters to be shared, and left p unshared. assigned initial values, and it worked like a champ-- i was able to find the two values i needed (kinh and KI) for 50 assays worth of data (each assay with 3-5 sets of data). i've been unable to do it again this year. now every time i set up this way i get a message "error 28036(?) try assigning p-2 fixed..." or something like that.
any got any ideas as to what's going on? |
fitting multiple data sets
Posted - 05/09/2006 : 01:35:54 AM
