# 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'