2014 Data Science Salary Survey by John King & Roger Magoulas

Author:John King & Roger Magoulas
Language: eng
Format: epub
Publisher: O'Reilly Media, Inc.
Published: 2014-11-12T05:00:00+00:00

Regression Model of Total Salary

Continuing toward the goal of understanding how demographics, position, and tool use affect salary, we now turn to the regression model of total salary.8 Earlier, we mentioned some one-variable comparisons, but there is an important difference between those observations and this model: before there was no indication of whether a given discrepancy was attributable to the variable being compared or another one that correlates with it, but here observations about a variable’s effect on salary can be understood with the phrase “holding other variables constant.”

For each tool cluster, one variable was included in the potential predictors with a value equal to the number of this cluster’s tools used by a respondent. Demographic variables were given approximate ordinal values when appropriate,9 and most variables that obviously overlapped with others were omitted.10 From the 86 potential predictor variables, 27 were included in the final model.11 The adjusted R-squared was .58: that is, approximately 58% of the variation in salary is explained by the 27 coefficients.

Variable (unit) Coefficient in USD

(constant) - + $30,694

Europe - – $24,104

Asia - – $30,906

California - + $25,785

Mid-Atlantic - + $21,750

Northeast - + $17,703

Industry: education - – $30,036

Industry: science and technology - – $17,294

Industry: government - – $16,616

Gender: female - – $13,167

Age per 1 year + $1,094

Years working in data per 1 year + $1,353

Doctorate degree - + $11,130

Position per level12 + $10,299

Portion of role as manager per 1% + $326

Company size per 1 employee + $0.90

Company age per 1 year, up to ~30 – $275

Company type: early startup - – $17,318

Cloud computing: no cloud use - – $12,994

Cloud computing: experimenting - – $9,196

Cluster 1 per 1 tool – $1,112

Cluster 2 per 1 tool + $1,645

Cluster 3 per 1 tool + $1,900

Bonus - + $17,457

Stock options - + $21,290

Stock ownership - + $14,709

No retirement plan - – $21,518

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