Oesophageal Clearance Analysis

Contents

This work is based on the model of oesophageal clearance developed by Haylett et al 2007 and is copyright (c) 2011 by K.R.Haylett

Filename analysed

filename =
c:/ph/as.xls

Plot of pH data

Basic signal statistics

phstats = 
       num: 19515
       max: 8.4800
       min: 0.1000
      mean: 5.9619
    median: 5.9400
     range: 8.3800
       std: 0.6317
clearances =
    73

Plot of clearances, mean clearance and fit

Model fit parameters and 95% confidence intervals

phfit =
     General model:
       phfit(x) = a*exp(-b*x)+c
     Coefficients (with 95% confidence bounds):
       a =      -1.608  (-1.737, -1.478)
       b =      0.2251  (0.2, 0.2502)
       c =       6.458  (6.442, 6.475)

Plot of fit with 95% confidence intervals

Goodness of fit statistics

phgof = 
           sse: 0.1625
       rsquare: 0.9597
           dfe: 57
    adjrsquare: 0.9583
          rmse: 0.0534

Fitting details

phout = 
           numobs: 60
         numparam: 3
        residuals: [60x1 double]
         Jacobian: [60x3 double]
         exitflag: 1
       iterations: 11
        funcCount: 45
    firstorderopt: 2.4069e-004
        algorithm: 'Trust-Region Reflective Newton'