How to read this section: We test whether three price-based signals —
12-month momentum (trailing stock return), realized volatility (annualized standard deviation of daily returns), and
relative strength (stock return minus S&P 500 return) — predict next-quarter fundamental outcomes:
revenue growth, operating margin change, and ROE change (all year-over-year to remove seasonality).
Each cell shows the Pearson correlation (r) between signal at quarter Q and outcome at quarter Q+1.
Values closer to +1 or −1 indicate stronger predictive relationships. “n” is the number of quarterly observations.
The analysis of price‑based signals—12‑month momentum, realized volatility, and relative strength—against fundamental outcomes for NPK International Inc. (NPKI) over the 2015Q1‑2026Q1 window yields no statistically reliable relationships. All examined signal–outcome pairs suffer from insufficient sample sizes (n=2) to compute meaningful correlation coefficients, resulting in 'insufficient' designations across revenue growth, margin change, and ROE change. Consequently, there is no evidence that any of the price signals consistently anticipate shifts in the company’s underlying financial performance within the 45‑quarter sample.
All signal–outcome correlations (12M Momentum, Realized Volatility, Relative Strength vs. Revenue Growth, Margin Change, ROE Change) have n=2, which is insufficient for reliable statistical inference.
No r-values or p-values could be computed; thus no signal meets the |r|≥0.4 threshold for notable predictive strength.
Cross‑company patterns cannot be identified because NPKI is the sole company in the dataset and provides no actionable signal relationships.
Limitations: Sample size per signal–outcome pair is extremely small (n=2), preventing estimation of correlation coefficients or significance levels. Potential regime shifts (e.g., macroeconomic cycles, industry disruptions) are not captured due to limited observation windows, risking spurious findings if larger samples were available. Correlation does not imply causation; even with adequate data, price signals may reflect market sentiment rather than underlying fundamentals.
NPKI
For NPK International Inc., none of the three price signals demonstrates predictive power for the examined fundamentals. The attempted calculations produce undefined r-values and p-values because each signal–outcome pair is based on only two observations, far below the threshold required for statistical inference (generally n≥30). Without sufficient data, any apparent correlation would be indistinguishable from random noise, precluding a defensible interpretation of momentum as a leading indicator or volatility as a proxy for risk‑adjusted performance in this context.