This example illustrates a log-linear model of independence, using data that contain structural zero frequencies as well as sampling (random) zero frequencies. In a population of six squirrel monkeys, ...

Model the data as a log-linear model with (the Poisson variance function) and where Y ij = number of epileptic seizures in interval j; t ij = length of interval j; The correlations between the counts ...

Here is that spreadsheet with the same data AND with the SLOPE() and INTERCEPT() function in google docs to show the answer is the same. There. That is the the basic form of linear regression by hand.