PMID- 1164838 OWN - NLM STAT- MEDLINE DCOM- 19751212 LR - 20191028 IS - 0010-468X (Print) IS - 0010-468X (Linking) VI - 5 IP - 1 DP - 1975 Sep TI - A computer program for the graphical and iterative fitting of probability density functions to biological data. PG - 11-38 AB - A tutorially-assisted, interactive program, written for a Digital Equipment Corporation LAB-11 minicomputer (PDP-11/20, is described which allows a user to fit (with or without automatic estimation of initial parameter values), by a method of nonlinear least squres, any one of seven different types of probability density functions (p.d.f.'s) to an empirical frequency distribution; the latter of which may be input to the program or formed by the program whenever it is furnished a series of times between events. The iteratively-obtained, "best fit" p.d.f. is displayed on a two color, point-plot display against the background of a point-plot histogram. By selecting any one of nine output modes, the user is allowed: (1) to view histograms successively on the point-plot display, (2) to generate selected p.d.f.'s (3) to "force" p.d.f.'s having known parameters through the histogram data, (4) to obtain Chi-square (x2) and Kolmogorov-Smionov estimates of the goodness of fit to the data, and (5) to apply a special test [Williams and Kloot, 1953] in order to determine whether the least squares estimates of two candidate models are statistically different. The resident driver program and the four overlayable program segments are written in standard FORTRAN IV; except for two plot routines, which are written in PDP-11 assembly language. FAU - Brassard, J R AU - Brassard JR FAU - Correia, M J AU - Correia MJ LA - eng PT - Journal Article PL - Netherlands TA - Comput Programs Biomed JT - Computer programs in biomedicine JID - 0237013 SB - IM MH - *Computers MH - *Probability MH - Probability Theory MH - *Statistics as Topic EDAT- 1975/09/01 00:00 MHDA- 1975/09/01 00:01 CRDT- 1975/09/01 00:00 PHST- 1975/09/01 00:00 [pubmed] PHST- 1975/09/01 00:01 [medline] PHST- 1975/09/01 00:00 [entrez] AID - 10.1016/0010-468x(75)90024-0 [doi] PST - ppublish SO - Comput Programs Biomed. 1975 Sep;5(1):11-38. doi: 10.1016/0010-468x(75)90024-0.