Hospital-level data is used from the Study on the Efficacy of Infection control in hospital.

Research question: Explore the relationship between average length of stay (in days) for all patients in the hospital (length) and the average daily number of patients in the hospital (census).

Pleaseinterpret in a linear regression setting with

1. Dependent variable log-transformed (see below)

The REG Procedure

Model: MODEL1

Dependent Variable: loglength

Parameter Standard

Variable DF Estimate Error t Value Pr > |t|

Intercept 1 2.14339 0.02359 90.85 <.0001

census 1 0.00055773 0.000096275.79 <.0001

Independent variable log-transformed (see below),

The REG Procedure

Model: MODEL1

Dependent Variable: length

Parameter Standard

Variable DF Estimate Error t Value Pr > |t|

Intercept 1 3.93711 0.97957 4.02 0.0001

logcensus 1 1.15513 0.19554 5.91 <.0001